Covid-19: C.D.C. Says It’s Safe to Reopen Schools, With Precautions

C.D.C. officials say most available evidence indicates schools can be safe if precautions are taken on campus and in the community.

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Students arriving for in-person learning at a public school in Brooklyn this month.Credit...Andrew Seng for The New York Times

Open schools. Close indoor dining.

When to keep schools open, and how to do so, has been an issue plaguing the response by the United States to the pandemic since its beginning. President Biden vowed to “teach our children in safe schools” in his inaugural address.

On Tuesday, federal health officials weighed in with a call for returning children to the nation’s classrooms as soon as possible, saying the “preponderance of available evidence” indicates that in-person instruction can be carried out safely as long as mask-wearing and social distancing are maintained.

But local officials also must be willing to impose limits on other settings — like indoor dining, bars or poorly ventilated gyms — in order to keep infection rates low in the community at large, researchers at the Centers for Disease Control and Prevention said in the journal JAMA and in a follow-up interview.

School administrators must limit risky activities such as indoor sports, they added. “It’s not going to be safe to have a pizza party with a group of students,” Margaret Honein, a member of the C.D.C.’s Covid-19 emergency response team and the first author of the article, said in an interview. “But outdoor cross-country, where distance can be maintained, might be fine to continue.”

Federal officials cited the many benefits of in-person schooling for children, and argued for prioritizing their educational, developmental and emotional and mental health needs. “Schools are an important source not just of education, but health and social services for children,” Dr. Honein said.

Even though the pandemic is rapidly changing, and contagious new variants are spreading, Dr. Honein and other C.D.C. officials argued there is little evidence that schools spark the kind of outbreaks seen in nursing homes and meatpacking plants, or contribute to increased transmission in communities.

“Back in August and September, we did not have a lot of data on whether or not we would see the same sort of rapid spread in schools that we had seen in other high-density work sites or residential sites,” Dr. Honein said. “But there is accumulating data now that with high face mask compliance, and distancing and cohorting of students to minimize the total number of contacts, we can minimize the amount of transmission in schools.”

The call by Dr. Honein and other officials reflects a consensus among some leading educators and public health experts that schools should be the last to close and the first to open when shutdowns are necessary.

Last year, all kindergarten to grade 12 public schools closed for in-person instruction by March 25, shortly after the World Health Organization declared that the new coronavirus outbreak was a pandemic. Many schools subsequently switched to online teaching models for the rest of the school year.

During the fall term, about one-quarter of school districts were completely online, about half were using a hybrid model, and fewer than one-quarter were fully open for in-person teaching. Yet more than half of school districts had students participating in sports programs.

In an opinion column in USA Today earlier this week, Randi Weingarten, the president of the American Federation of Teachers, and Dr. Rajiv Shah, president of the Rockefeller Foundation, called for widespread testing to keep schools safe and get children back into the classroom, not only for educational reasons, but to restore free school meals, give children a social outlet, and provide myriad school-based services that are vital to low-income children.

The Covid-19 School Response Dashboard, a collaboration that tracks infections in school districts willing to share data, has reported that infection case rates among staff in October and November were similar to case rates in the surrounding communities. More recently, however, staff case rates in New York increased at a faster rate than community case rates.

The causes are not clear. The increases may reflect a more frequent testing of schoolteachers. Case rates increased among teachers engaged in in-person teaching and among those teaching remotely, suggesting in-person instruction was not the sole factor.

Emily Oster, a professor of economics and public policy at Brown University who created the dashboard, said that low case rates in the community make it possible to keep schools running safely.

“Prioritizing schools is going to mean limiting some of those other activities, and deciding that we want to undertake some of those sacrifices to keep schools open, because we’ve decided as a society that schools are important relative to other things,” Dr. Oster said.

“The frustration for many people is that you can go to an indoor restaurant. In Massachusetts, I could go to an indoor water park like Great Wolf Lodge — I can take my kids to Great Wolf Lodge. But in a lot of places in Massachusetts, there has been no school.”

The C.D.C. also published two related studies on Tuesday. One was an investigation of a high school wrestling tournament in Florida in December that became a super-spreader event, leading to at least 79 infections and one death.

The tournament brought together 10 schools and 130 athletes and coaches, and 30 percent of participants were infected with the coronavirus. Thirty-eight individuals went on to transmit the virus to at least 41 others, including family members. (The full number is not yet known, because fewer than half the participants were tested.)

The researchers calculated that 1,700 in-person school days were lost to quarantines and isolation of patients and their contacts. The number would have been higher if not for the December holiday break.

C.D.C. researchers also took a look at 17 elementary and secondary schools in rural Wisconsin where mask-wearing was routine. The incidence of infection was lower in schools than in the community at large, the scientists found. During 13 weeks in the fall of 2020, there were 191 infections among staff and students; only seven resulted from in-school transmission, according to the study.

Biden said his administration was nearing a deal with Pfizer and Moderna for 200 million more doses by summer’s end. It may not speed up vaccinations.

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Biden Administration Orders 200 Million More Vaccine Doses

President Biden announced on Tuesday that his administration was working on a deal to secure the doses of coronavirus vaccine from Pfizer and Moderna by the end of the summer. The deal is unlikely to accelerate the current pace of vaccination for several months.

This will be one of the most difficult operational challenges we’ve ever undertaken as a nation. I’ve said that before, but I must say it again, because we’re going to do everything we can to get it done. After a review of the current vaccine supply and manufacturing plans, I can announce that we will increase overall weekly vaccination distributions to states, tribes and territories from 8.6 million doses to a minimum of 10 million doses. And we believe that we’ll soon be able to confirm the purchase of an additional 100 million doses for each of the two F.D.A.-authorized vaccines, Pfizer and Moderna. That’s 100 million more doses of Pfizer and 100 million more doses of Moderna — 200 million more doses than the federal government had previously secured. Not in hand yet, but ordered. We expect these additional 200 million doses to be delivered this summer. We didn’t get into this mess overnight. And it’s going to take months for us to turn things around. But let me be equally clear: We’re going to get through this. We will defeat this pandemic.

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President Biden announced on Tuesday that his administration was working on a deal to secure the doses of coronavirus vaccine from Pfizer and Moderna by the end of the summer. The deal is unlikely to accelerate the current pace of vaccination for several months.CreditCredit...Jim Wilson/The New York Times

President Biden announced on Tuesday that his administration was nearing a deal with Pfizer and Moderna to secure an additional 200 million doses of coronavirus vaccine by the end of the summer — a time frame that his predecessor had also envisioned, and one that may not accelerate the current pace of vaccination for months.

The purchases would boost the administration’s total vaccine order by 50 percent, raising it from 400 million to 600 million doses — enough to vaccinate 300 million Americans by the “end of the summer, beginning of the fall,” Mr. Biden said.

Although the president has been in office for less than a week, he is already under intense pressure from a frustrated public to accelerate vaccinations. Tuesday’s announcement will enable Mr. Biden to underscore that he shares those concerns.

The deal would provide the federal government with 100 million doses of the Pfizer vaccine and 100 million doses of the Moderna vaccine, Mr. Biden said.

Speeding up what has been a slow distribution of vaccines has taken on more urgency with the arrival of more contagious virus variants in the country.

But while the president has vowed to use the Defense Production Act if necessary to increase vaccine supply, there is little he can do in the short term. Federal health officials and corporate executives agree that it will be hard to boost the immediate supply of the Moderna and Pfizer vaccines — the only two that have federal authorization — before April because of lack of manufacturing capacity.

Pfizer had agreed last summer to provide an initial 100 million doses to the United States by the end of March. Under a new agreement reached last month by the administration of former President Donald J. Trump, Pfizer agreed to provide an additional 70 million doses by the end of June and another 30 million by the end of July, doubling the deliveries it promised in the initial contract.

This latest deal would apparently obligate Pfizer to deliver another 100 million over the summer, or roughly the third quarter of the year.

The original contract said that while the government could request that new tranche of vaccine, Pfizer could “reasonably” refuse it. But there was little expectation that Pfizer, an American company, would do so.

Mr. Biden also said the federal government’s weekly allocations of coronavirus vaccines would increase by about 1.4 million doses starting next week.

“This is going to allow millions more Americans to get vaccinated sooner than previously anticipated,” he said.

The increase, to around 10 million doses given to states, territories and tribes each week, will come from the federal government’s plans to release more of the vaccine made by Moderna, the Massachusetts biotech company whose vaccine was authorized for emergency use in December. Although governors will probably welcome the news, it does not reflect any increase in the overall amount that Moderna will deliver to the federal government in the first three months of this year, according to people familiar with the company’s production.

Governor Andrew Cuomo, the chairman of the National Governors Association, said that New York, where more than 42,000 people have died, welcomed both the increase in doses and Mr. Biden’s assurances that those vaccine allocations would be maintained in weeks to come. “You really can’t plan and schedule when you don’t know what you’re going to get next week,” Mr. Cuomo said on MSNBC. At the same time, he conceded “it’s not enough,” as the state continues to try to vaccinate nearly 20 million residents. “At this rate, we’re talking about months and months,” he said.

Tracking the Coronavirus ›

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The world reaches a staggering milestone of more than 100 million known virus cases.

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Medical personnel transporting a patient at Salinas Valley Memorial Healthcare System in Salinas, Calif., on Sunday.Credit...Joel Angel Juarez for The New York Times

The world surpassed a total of 100 million known coronavirus cases on Tuesday, according to a New York Times database, a staggering milestone for a global health crisis that is entering a phase of both hope and deep concern.

Experts say that 100 million most likely underestimates the true number of cases, given the lack of adequate testing and contact tracing in many countries, including the United States. Likewise, the number of deaths — more than two million people worldwide, including more than 420,000 in the United States — is probably much higher than officially reported.

Despite lockdowns, social distancing and other measures, the increase in cases has only accelerated in recent months. Global coronavirus cases topped 25 million at the end of August, more than eight months after the virus was first detected in Wuhan, China. By mid-November they had doubled to 50 million. It took less than three months for them to double again.

In one positive sign, the number of daily new cases in the United States, which has the worst outbreak in the world, has been on the decline in recent weeks. U.S. deaths, though, remain high, numbering more than 3,000 per day on average in recent days. While the U.S. decrease in cases has contributed to a recent decline in the number of daily new cases reported worldwide, there are still more than 500,000 new cases being reported around the globe each day on average.

Health experts also worry that new variants of the virus could bring a resurgence in U.S. numbers as they have in Britain, Ireland and South Africa. Those fears have prompted new lockdowns and travel restrictions around the world.

Weariness over the pandemic and the associated economic pain remains palpable, even as experts warn that preventive measures remain necessary in many areas. A United Nations official said Monday that the pandemic had precipitated the greatest global labor crisis since the Great Depression.

Some of the strongest stirrings of hope came in December, when large-scale rollouts of coronavirus vaccines began in earnest. But the global supply of the new vaccines has thus far been insufficient to meet the demands of the most vulnerable.

“There is not enough vaccine right now to even serve those who are most at risk,” Dr. Michael Ryan, head of the emergencies program at the World Health Organization, said Monday.

In an increasingly interconnected world, the economic fallout from a flawed vaccine distribution plan could prove difficult to contain, much like the virus itself. According to a report released Monday, inequitable vaccine distribution could cost the global economy more than $9 trillion. Wealthy nations, which in some cases have secured enough doses to vaccinate their populations several times over, would absorb about half of those costs, the report found.

Under pressure to speed up the U.S. pace of coronavirus vaccination, President Biden said on Tuesday that his administration was nearing a deal with Pfizer and Moderna to secure an additional 200 million doses of vaccine by the end of the summer — a time frame that his predecessor had also envisioned. It may not accelerate the current pace of vaccination for months.

The State Department is warning Americans that help will be limited if they go abroad for nonessential reasons.

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A testing center at Pueblo Bonito Sunset Beach Golf & Spa Resort in Los Cabos, Mexico.Credit...Pueblo Bonito Sunset Beach

Beginning Tuesday, travelers flying into the United States from any other country must present proof of a negative test for the coronavirus. The State Department is also urging Americans to avoid traveling abroad for nonessential reasons, warning that those who test positive or cannot access a test could get stuck abroad for an extended period of time — and that for them, assistance from the U.S. government will be limited.

“The Department of State is committed to helping U.S. citizens overseas who find themselves in dire situations, but that assistance is likely to be limited,” said the Bureau of Consular Affairs Acting Assistant Secretary Ian Brownlee. “Our goal is to help people avoid those dire straits in the first place.”

The directive was in line with the new tone from the Biden administration which has tightened rules around international travel. Many other countries have been requiring negative test results for months.

While travel globally will be affected, especially in light of the Biden administration’s decision to bar travelers — excluding American citizens — from Brazil, Britain, Ireland, South Africa and 26 countries in Europe that allow travel across open borders, the biggest impact of the testing rule will be for destinations in the Caribbean and Mexico, which have continued to attract American leisure travelers who cannot go to other parts of the world.

“We keep getting curveballs thrown at us in our whole industry,” said Jason Kycek, senior vice president of sales and marketing at Casa de Campo, a golf-and-beach resort in the Dominican Republic that is expanding its existing on-site testing facilities. “The finish line keeps moving, but we are staying on top of things and making sure our guests have what they need and can travel safely.”

Mexico and countries in the Caribbean have remained popular destinations for American travelers even as other destinations closed their borders, in part because of their proximity to the United States, making them relatively easy and affordable to reach. In the fall, several U.S. airlines added flights to the Caribbean islands and to Mexico at a time when routes elsewhere were being cut. In November, nearly 500,000 Americans flew to Mexico alone, according to official figures.

Under the new requirement, travelers seeking to enter the United States will need to get tested no more than three days before their scheduled flight, showing a negative result to their airline before boarding. Those who have already had the virus will need to show documentation of recovery in the form of a recent positive viral test and a letter from a health care provider or a public health official stating they were cleared to travel.

Americans who test positive or cannot access a test could be stuck abroad for several weeks and should be prepared to pay for their medical care and lodging, Mr. Brownlee said.

“All travelers should have a plan B,” he said. He added that before traveling, Americans should ask themselves the following questions about what they would do if they were stuck in another country longer than intended: “Where would you stay? How would you pay for that extended stay? What would happen at home if you couldn’t get back to work, couldn’t get back to take care of your children or any of your other responsibilities?”

The United States will accept results from rapid antigen tests, while other countries have been asking for what are known as polymerase chain reaction tests, or P.C.R. tests. Antigen tests have been found to be less reliable than P.C.R. tests. U.S. embassies in other countries will not offer tests.

For an industry already decimated by the pandemic, the new testing requirement may cut into any business rebound. Last week, United Airlines told reporters on its fourth-quarter earnings call that Mexican destinations were among the most affected by the new testing requirement.

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Students in Chicago Public Schools are told to stay home as a clash with the teachers’ union escalates.

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Earlier in January, Chicago teachers had set up computers outside public schools, holding virtual classes as a show of support for pre-K educators teaching inside.Credit...Anthony Vazquez/Chicago Sun-Times, via Associated Press

With the clash between the Chicago Public Schools and its teachers’ union escalating and thousands of teachers planning to stay home starting on Wednesday to protest the district’s reopening plan, on Tuesday evening the district told parents of prekindergarten and special education students who have been attending school in person that it had “no choice” but to ask them to keep their children home on Wednesday.

“For the past three weeks, thousands of CPS students have been safely learning in person, and the union’s action will prevent these students from receiving the classroom support their parents needed and chose,” the district’s chief executive, Janice K. Jackson, said in a letter to families.

The union has fiercely opposed the reopening plan, under which the district brought an initial cohort of students back into buildings this month and planned to welcome kindergarten through eighth grade students on Monday. Most students in the district, the nation’s third largest, have been learning remotely since last March.

Dr. Jackson said in her letter that the district was continuing to try to reach an agreement with the union. She said the district had made changes to its plan to address some of the union’s concerns, including increasing the frequency of planned surveillance testing of staff to twice a month and testing students in the 10 ZIP codes with the highest positivity rates once a month.

But she said that the union was continuing to make demands that did not align with public health guidance, including demanding that its members be vaccinated “ahead of other city residents, including the elderly, first responders, grocery store employees, and other school staff members who have been in schools regularly since the pandemic began.”

While teachers were being prioritized in the city’s vaccination efforts, she wrote, city leaders “cannot cast aside an equitable vaccination plan and deprioritize the needs of other deserving community members who are at greater risk and performed essential work throughout the closure.”

Meanwhile, the union said Tuesday evening that it was calling for mediation to broker an agreement.

“If solving the problem of how to reopen school buildings while ensuring the safety of educators, staff and students in the middle of a pandemic was easy, then CPS and CTU would have already done it,” said Randi Weingarten, the president of the American Federation of Teachers, the national union. “That’s why appointing a mediator is the right move, right now.”

Key data of the day

Just how fast is the U.S. vaccine rollout rolling?

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Only 6 percent of the U.S. population has received the first of the two required doses of vaccine; only 1 percent have gotten both doses and are fully immunized.Credit...James Estrin/The New York Times


More than a million people a day, on average, have received a shot to help protect them against Covid-19 in the U.S. over the last week, and the national vaccination effort has been gathering speed.

Yet even at that pace, the vaccine has reached only a small proportion of Americans — far too few yet to significantly slow the spread of the virus.

So far, only 6 percent of the U.S. population has gotten the first of the two required doses of vaccine; only 1 percent have gotten both doses and are fully immunized.

What do those percentages mean in human terms? According to the Centers for Disease Control and Prevention tracker, 19.9 million people had received at least one shot by midday on Tuesday — meaning that the nation is only now, almost four weeks into 2021, reaching the goal of 20 million that the Trump administration set for Dec. 31. Of those 19.9 million, about 3.4 million Americans have received their second shot as well.

At that scale, the vaccines are protecting the recipients, but not doing much yet for anyone else. The country will not start to gain the effects of herd immunity — when the virus has trouble spreading because most people who encounter it already have antibodies — until at least 60 percent of the population has either been vaccinated or survived an infection, according to Caitlin Rivers, an epidemiologist at the Johns Hopkins Center for Health Security.

The minimum threshold may be getting higher now, as new, more transmissible variants of the virus take hold, she said. And even after a degree of herd immunity is reached, the virus will continue to spread, just at a far less dangerous rate.

“It doesn’t mean the virus completely goes away,” she said, “but it kind of moves into the background.”

All kinds of things went wrong when the vaccine rollout started, including problems with supply, staffing, logistics and communications. But with time, most states have built up their capacity to administer shots, and 45 states have moved beyond the narrow initial categories of nursing home residents and frontline health care workers to start inoculating all residents above a certain age.

So the national pace has more than doubled in a month, setting the country on track to meet President Biden’s initial goal of getting at least one shot into 100 million people in his first 100 days in office — a million a day.

Yet even at that rate, the Biden administration estimates that by the end of April, about 67 million people will have had both shots and be fully protected — less than halfway to the 160 million or more who may need to be vaccinated for a level of herd immunity, even after allowing for people with natural antibodies from a cleared infection.

On Monday, President Biden raised his goal to 1.5 million shots a day.

Federal health officials and pharmaceutical executives agree that it will be impossible to increase the immediate supply of vaccines before April because Pfizer’s and Moderna’s factories are already running flat out, but the companies hope to get more production lines running after that. On Tuesday, Biden administration officials said they were near a deal to buy 200 million more doses of those companies’ vaccines for delivery in the summer.

And another manufacturer, Johnson & Johnson, is expected to report the results of clinical trials soon on the vaccine it has developed. If it proves to be safe and effective and wins authorization, that would help expand the vaccine supply even more.

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A state representative is kicked out of Georgia’s House chamber after refusing a coronavirus test.

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State Representative David Clark, who was expelled from the House chamber on Tuesday, said he believed it was political retaliation from a fellow Republican.Credit...Bob Andres/Atlanta Journal-Constitution, via Associated Press

A Georgia state trooper escorted a Republican state lawmaker out of the House chamber in Atlanta on Tuesday after he refused to abide by the legislature’s coronavirus testing protocols.

Representative David Clark, who represents a suburban district northeast of Atlanta, was led from the chamber on the orders of Representative David Ralston, the House speaker and a fellow Republican. Mr. Ralston, without mentioning Mr. Clark’s name, had initially announced that a fellow member had not followed testing protocols, and asked that member to leave. But Mr. Clark refused.

“I don’t know about y’all but I’ve been to too many funerals — and I’m tired of going to them,” Mr. Ralston said from the House dais after ordering Mr. Clark removed.

Lawmakers are required to be tested twice weekly at a site in the Capitol while in session.

The flare-up was just the latest infighting among Georgia Republicans, who have been riven by former President Donald J. Trump’s efforts to overturn the state’s election results. Mr. Clark and other lawmakers signed on to an amicus brief supporting a Texas lawsuit, rejected by the U.S. Supreme Court, that had sought to overturn Mr. Trump’s losses in Georgia and three other swing states.

Mr. Ralston was among top Republican lawmakers who resisted Mr. Trump’s efforts to change the election results based on meritless accusations of widespread voter fraud.

Mr. Clark, in a phone interview on Tuesday, said he did not get tested because he was upset that people who worked in Georgia’s Statehouse had access to regular testing while many other Americans did not. “There are only so many tests,” he said.

Mr. Clark said that he was considering legal action to challenge his expulsion, and that he believed it was political retaliation by Mr. Ralston. Mr. Clark had earlier demanded Mr. Ralston’s ouster after an Atlanta Journal-Constitution investigation found that the speaker, who is a lawyer, used his political post to delay court cases for clients accused of child molestation, domestic abuse and rape, among other charges.

“The speaker is trying to crucify me for this because of what I’ve done to him in the past,” Mr. Clark said.

Mr. Clark said he was not a pandemic denier. But he said he considered the state’s regular testing regimen for lawmakers excessive if they were following the recommendations of public health experts to wear masks, monitor temperatures and socially distance.

He did not wear a mask while speaking to reporters in the Capitol.

A Wisconsin pharmacist will plead guilty to attempting to spoil hundreds of vaccine doses.

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Steven Brandenburg was skeptical of vaccines, according to the plea agreement, and had shared his beliefs in “conspiracy theories” and “alternative history” with his co-workers.Credit...Ozaukee County Sheriff's Office, via Associated Press

A Wisconsin pharmacist accused of intentionally sabotaging hundreds of Covid-19 vaccine doses will plead guilty to charges filed in federal court, the Department of Justice said on Tuesday.

Steven R. Brandenburg, a 46-year-old hospital pharmacist from Grafton, Wis., attempted to spoil the doses of the Moderna vaccine — which must be stored at cold temperatures to remain effective — by removing them from the hospital’s refrigeration unit, the Justice Department said.

Mr. Brandenburg will plead guilty to two counts of “attempting to tamper with consumer products with reckless disregard for the risk that another person would be placed in danger of death and bodily injury.” Each count carries a maximum sentence of 10 years in prison.

During two overnight shifts — on Christmas Eve and Christmas Day — Mr. Brandenburg left the doses out for several hours before returning them to the refrigerator for use the next day, according to a plea agreement.

Mr. Brandenburg had for at least two years told his co-workers about his beliefs in “conspiracy theories” and “alternative history” and had indicated that he was skeptical of vaccines, specifically the Moderna vaccine, according to the plea agreement. Police earlier called him an “admitted conspiracy theorist.

The doses that Mr. Brandenburg had removed from refrigeration made it into the arms of 57 people before his conduct was discovered. Whether the doses were actually rendered ineffective was still under investigation.

“The FDA has ensured that the Moderna Covid-19 vaccine meets the agency’s rigorous standards for quality, safety, and efficacy,” Catherine A. Hermsen, assistant commissioner for criminal investigations at the Food and Drug Administration, said in a statement. “Those who knowingly tamper with this vaccine place American patients’ health at risk. Today’s announcement should serve as a reminder that this kind of illicit tampering activity will not be tolerated.”

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For sale in Oklahoma: a large stockpile of hydroxychloroquine.

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Gov. Kevin Stitt, a Republican, purchased a stockpile of hydroxychloroquine in April and said it could be used for other things if it proved to be ineffective against Covid-19.Credit...George Frey/Reuters

The Oklahoma Department of Health is still trying to unload a stockpile of hydroxychloroquine — an antimalarial drug touted by former President Donald J. Trump as a “miracle” cure for Covid-19 despite a lack of evidence that it effectively treats the disease — that it purchased for $2 million last spring.

Mike Hunter, the state’s attorney general, has been brought on to assist the health department in selling back the drug, Alex Gerszewski, a spokesman for Mr. Hunter, said on Tuesday.

The state is attempting to sell the stockpile back to the company it purchased it from, FFF Enterprises, a California-based health care distributor, or to find another buyer, Mr. Gerszewski said. The company did not immediately respond to a request for comment.

Oklahoma has been trying to unload the stockpile for months. In July, the state health department told News 9, a local TV news station, that it was “working to sell it.”

A spokesman for the health department confirmed on Tuesday that the stockpile was still in the department’s possession but referred questions about the attempted return to the attorney general’s office.

Early, seemingly promising results, bolstered by political pressure, prompted the Food and Drug Administration to grant hydroxychloroquine an emergency authorization for use in very sick Covid-19 patients. Follow-up studies, however, found the drug neither sped recovery nor prevented healthy people from contracting the coronavirus or progressing to serious disease.

The F.D.A. revoked its emergency approval in June. The agency now warns that hydroxychloroquine can cause dangerous abnormalities in heart rhythm in coronavirus patients.

In April, Mr. Trump said he would place millions of hydroxychloroquine doses into a federal stockpile for use on Covid-19 patients. In May, he said he had been taking it himself, even though he was not infected with the coronavirus.

When Mr. Trump contracted the virus in October, he received an antibody cocktail and remdesivir, an antiviral drug. Hydroxychloroquine was not mentioned as part of his treatment.

The U.K. exceeds 100,000 reported deaths, and prepares to tighten travel restrictions.

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A cemetery in Chislehurst, England, this month. Deaths are rising in Britain as it confronts a highly contagious variant of the coronavirus.Credit...Hannah Mckay/Reuters

Prime Minister Boris Johnson of Britain promised on Tuesday to “learn lessons” from the coronavirus pandemic, as he acknowledged that the country had surpassed 100,000 total deaths.

“Its hard to compute the sorrow contained in that grim statistic — the years of life lost, the family gatherings not attended, and for so many relatives, the missed chance even to say goodbye,” Mr. Johnson said.

He called for the country to remember the lives lost and the efforts of the country’s health care workers as they struggle to help the afflicted and to contain the spread of the virus.

“I am deeply sorry for every life that has been lost, and as prime minister, I take full responsibility for everything that the government has done,” Mr. Johnson said, adding that the government would do everything in its power “to minimize, loss of life and to minimize suffering.”

The British government is preparing to announce tighter restrictions to combat a surge in new fast-spreading variants of the virus, which could include a mandatory hotel quarantine for travelers arriving from abroad. Mr. Johnson did not elaborate on those plans during his news conference.

Nadhim Zahawi, the British vaccine minister, told Sky News that an announcement on the travel rules would come later on Tuesday, but he declined to give details.

New data released by the Office for National Statistics earlier in the day put the total number of registered deaths in England, Northern Ireland, Scotland and Wales at 103,602 through Jan. 15.

The country has had some success in getting vaccinations going quickly. Simon Stevens, the chief executive of the National Health Service, said on Tuesday that so far, one in eight adults in the country had received the first of the two required vaccine doses. But he cautioned that there were still difficult times ahead.

“This is not a year that anybody is going to want to remember,” Mr. Stevens said.

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Regeneron’s antibody treatment prevented symptoms in people exposed to those with the virus, an early analysis shows.

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Regeneron’s monoclonal antibody treatment sharply cuts the risk of hospitalization and death among high-risk Covid-19 patients, a study found.Credit...Regeneron, via Associated Press

The drug maker Regeneron said on Tuesday that its Covid-19 antibody cocktail prevented illness in the family members of people who had tested positive for the virus, according to an early analysis of a clinical trial that has not yet been published in a scientific journal.

The antibody cocktail was authorized last fall to treat people who have already tested positive and are at high risk for complications from Covid-19, but this study looked at whether an injection of the cocktail — what they called a “passive vaccine” — could prevent infections.

The company said an early analysis of 400 trial participants found that the treatment completely prevented symptomatic infections, and also reduced the rate of asymptomatic infections. Among the 186 volunteers who received the treatment, 10 were infected with the virus but did not get sick. In contrast, of the 223 people who got a placebo, 23 tested positive for the virus and eight became ill with symptoms.

Regeneron is one of two companies — Eli Lilly is the other — that developed specially engineered antibodies to combat the virus soon after people are infected. Last fall, both companies received emergency authorization from the Food and Drug Administration to administer the drugs to people who are already infected with the virus.

Last week, Eli Lilly also released results from a trial showing that its antibody treatment prevented infections in nursing homes where an outbreak had occurred.

Despite the treatments’ early promise, the drugs have been sitting unused in many hospitals, even as the country has experienced a record wave of cases, hospitalizations and deaths. Doctors and hospital administrators have cited a range of reasons for not using the treatments more frequently, including challenges identifying the right patients, questions over whether they work, and logistical hurdles in administering the cocktails, which must be given as infusions in a clinic. (Regeneron’s preventive trial gave the antibodies as an injection instead.)

Regeneron has received more than $3 billion in federal funding to develop the antibody treatments and provide them to Americans.

In a statement on Tuesday, Regeneron’s president and chief scientific officer, Dr. George D. Yancopoulos, suggested that the treatment could be used to “break the chain” of transmission even as vaccines are slowly being rolled out. “Even with the emerging availability of active vaccines, we continue to see hundreds of thousands of people infected daily, actively spreading the virus to their close contacts,” he said.

Harris receives her second dose of the vaccine, urging all Americans to get it: ‘It will save your life.’

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Vice President Kamala Harris receiving the second dose of the Moderna vaccine at the National Institutes of Health in Bethesda, Md., on Tuesday.Credit...Anna Moneymaker for The New York Times

Vice President Kamala Harris on Tuesday afternoon received her second dose of the Moderna vaccine at the National Institute of Health’s Bethesda campus.

“When are ya gonna put it in?” she joked to the nurse administering the shot into her left arm, after it was already over. “It really was painless,” Ms. Harris said as the nurse put a Band-Aid on her arm, “relatively painless.”

Ms. Harris’ televised vaccination shot was part of the Biden administration’s ongoing attempt to instill confidence in the vaccine among skeptical Americans, and particularly among minority communities who are being infected with and dying of the coronavirus at higher rates.

In brief remarks after receiving her shot, Ms. Harris commended the staff at the N.I.H. for the research and dedication that resulted in what she called “something that will save your life.” Urging all Americans to take the vaccine when it becomes available to them, she reiterated: “It will save your life.”

During the Trump administration, scientists and scientific institutions were regularly undermined by the president and some of his top officials. In contrast, Ms. Harris noted that her mother worked at the N.I.H. and said that for scientists, “their whole reason for being is to see what can be, unburdened by what has been. Their whole reason for being is to pursue what is possible for the sake of improving human life and condition. It is such a noble pursuit.”

Ms. Harris sought to boost public trust in government and in science in particular, saying that for public health officials, “It’s not about profit, it’s about the people.”

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Borders tighten as more contagious coronavirus variants continue to be detected.

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At Kennedy Airport in New York on Monday. Several countries are imposing restrictions on international air travelers, including the United States.Credit...Spencer Platt/Getty Images

Around the world, borders were being tightened this week as rising cases and the threat of more contagious virus variants taking hold prompted travel policy changes from the United States to Europe to Australia.

Even as the United States moved to impose travel restrictions, citing the danger of the fast-moving variants, a case of the variant spreading in Brazil was identified in Minnesota.

In Europe, France is moving to impose strict border measures, Britain is considering a mandatory hotel quarantine for some travelers, and the European Union is urging more coordinated action among member states to limit travel.

Germany’s interior minister, Horst Seehofer, said on Tuesday that his country was considering “the reduction of air traffic to Germany to almost zero” to head off the spread of the variants. “The people who accept tough restrictions in Germany expect us to protect them as best we can from an explosion in infection numbers,” he told the Bild newspaper.

Already, a hospital in Berlin and another in the state of Bavaria have stopped taking any new patients and have sent much of their staff into quarantine after the B.1.1.7 variant was detected, raising fears that the country’s current safety measures were not stringent enough to meet the new threat.

Prime Minister Jacinda Ardern of New Zealand said on Tuesday that the country’s borders would remain closed until New Zealanders had been “vaccinated and protected.” Australia has suspended its travel bubble with New Zealand for 72 hours from Monday, after New Zealand confirmed a case outside its quarantine system of the variant found in South Africa.

As of Tuesday, the United States will begin requiring a negative virus test from all arriving international air travelers. The Biden administration has announced that it is extending a ban on travel by noncitizens into the United States from Brazil, Britain and 27 other European countries, and adding South Africa to the list. The State Department also urged Americans not to travel abroad for nonessential reasons, warning that if they tested positive or were unable to present proof of a negative test, assistance from the U.S. government “is likely to be limited.

The Brazil-based variant, known as B.1.1.28.1 or P.1, was identified Monday in a Minnesota resident who had recently traveled to Brazil, the state health authorities said, which could suggest that the variant might not yet be widely circulating.

Dr. Anthony S. Fauci, an adviser to President Biden, said it was only a matter of time before the Brazil-based variant was detected in the United States. “With the world travel that you have, and the degree of transmissibility efficiency, it’s not surprising,” he said.

The variants have arrived just as there are signs of progress. Hospitalizations, after peaking in early January, are at their lowest level nationally since Dec. 13, according to the Covid Tracking Project. The average daily caseload in the United States is down by about one-third compared with two weeks ago, according to a New York Times database.

And after a slow start, the pace of vaccinations is picking up, and the United States already seems to be vaccinating well over a million people per day, according to a New York Times analysis of data from the Centers for Disease Control and Prevention. Mr. Biden said Tuesday that his administration was nearing a deal with Pfizer and Moderna to secure additional doses that would allow a total of 300 million Americans to be vaccinated by the “end of the summer, beginning of the fall.”

But scientists fear much of the country’s momentum could be quickly halted if the variants continue to spread unchecked. They are especially anxious about the variants spreading in Brazil and South Africa, which share many mutations, because they may be able to blunt the effectiveness of vaccines.

The United States is flying blind, scientists have warned, as the country navigates the spread of the new variants without a large-scale, nationwide system for checking virus genomes for new mutations. Instead, the work of discovering the variants has fallen to a patchwork of academic, state and commercial laboratories.

Scientists say that a national surveillance program would be able to determine just how widespread the new variant is and help contain emerging hot spots, extending the crucial window of time in which vulnerable people across the country could get vaccinated.

A Vancouver couple was fined after flying to a remote town for vaccination.

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An airport in Beaver Creek, in the Yukon Territory, where a couple from Vancouver is accused of violating coronavirus restrictions to get vaccinated.Credit...Google Maps

A Canadian couple violated coronavirus restrictions when they traveled to the Yukon Territory last week to get vaccinated, according to the authorities, prompting accusations of entitlement and raising concerns about infection in a remote community of about 100 people.

The couple, Rodney and Ekaterina Baker, of Vancouver, British Columbia, face fines of $1,000 for failing to isolate themselves for 14 days after they traveled to Yukon, even though they said they would, court records show.

Additionally, Mr. Baker, 55, who was the chief executive of the Great Canadian Gaming Corporation, which operates casinos and hotels across Canada, resigned from his position on Sunday. Ms. Baker, 32, is an actress.

According to charging documents and Yukon authorities, the Bakers traveled about 1,200 miles to Yukon’s capital city, Whitehorse, on Jan. 19. The Canadian Broadcasting Corporation reported that instead of quarantining for the required 14 days, the couple chartered a flight to Beaver Creek, which is about 300 miles northwest of Whitehorse, last Thursday, claimed to be working at a motel in the area and got their shots.

They returned to Whitehorse before the authorities, acting on a tip from Beaver Creek, found them later that day, according to court records.

“I am outraged by this selfish behavior and find it disturbing that people would choose to put fellow Canadians at risk in this manner,” John Streicker, Yukon’s community services minister, said in a statement. “Reports allege these individuals were deceptive and violated emergency measures for their own advantage, which is completely unacceptable at any time, but especially during a public health crisis.”

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Minnesota will ramp up virus sequencing after a variant from Brazil was found in the state.

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Minnesota will expand its virus sequencing efforts after a variant from Brazil was found in the state. Credit...Christophe Archambault/Agence France-Presse — Getty Images

Public health officials in Minnesota are expanding their surveillance of coronavirus mutations after discovering this week that someone in the state was infected with a more contagious variant of the virus, the state’s epidemiologist said.

The state will sequence about 100 specimens of the virus each week, up from 50, in an effort to detect more variants, Dr. Ruth Lynfield, the epidemiologist, said in an email.

Officials announced on Monday that a Minnesota resident who had traveled to Brazil tested positive for a variant of the virus that first appeared there. It is the first confirmed case in the United States.

“We are going back and re-interviewing people who we identify as having a variant to learn more about their exposures, potential travel and contacts,” Dr. Lynfield said in the email.

The Brazilian variant is similar to one first found in South Africa, public health officials said. While the Moderna and Pfizer vaccines are slightly less effective with the South African variant, the drug companies say that they still provide protection.

Minnesota officials will continue to try to vaccinate as many people as possible as an important tool to fight against the virus , Dr. Lynfield said.

Public health officials globally have said that the more the virus is allowed to spread, the greater the chances that new variants will form. In addition to the ones initially found in Brazil and South Africa, another variant was first found in Britain. That variant has since been confirmed in at least 22 states in America. The variant from South Africa has not been found in the United States.

Dr. Lynfield said state officials were cautioning residents against traveling and urging them to double down on taking steps to mitigate the spread of the coronavirus.

“We are reminding Minnesotans of the importance of prevention measures, such as wearing masks, social distancing, avoiding gatherings outside your household, etc., to limit transmission of the virus,” Dr. Lynfield said. “Careful prevention measures will help decrease the spread of variants and of other strains of the virus.”

Dutch cities brace for a fourth night of anti-curfew violence.

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A damaged supermarket in Rotterdam, The Netherlands, after clashes between a group of young people and the police on Monday night.Credit...Marco De Swart/EPA, via Shutterstock

Shopkeepers boarded up windows and sent employees home early in several cities across the Netherlands on Tuesday, as the country braced for a fourth night of protests against a 9 p.m. curfew that is meant to slow the spread of the coronavirus.

Hundreds of protesters have been arrested since the curfew went into effect nationwide on Saturday, the authorities said. Rioters have looted stores, burned a Covid-19 testing center, and thrown fireworks and rocks at the police in Amsterdam, Rotterdam and other cities.

“Officers have been injured, and residents felt unsafe in their own homes,” Hugo Hillenaar, the chief public prosecutor of Rotterdam, said on Tuesday, after police made dozens of arrests on Monday night. “As a society, we absolutely cannot tolerate this.”

Government officials have said the protests were no reason to change the strict lockdown measures, and on Tuesday, Prime Minister Mark Rutte of the Netherlands denounced the “criminal violence” that had erupted.

“The riots have nothing to do with protesting or fighting for freedom,” Mr. Rutte wrote on Twitter. “We must win the fight against the virus together, because only then can we regain our freedom.”

Though daily counts of new coronavirus cases have been declining in the Netherlands, Dutch authorities said last week that stricter restrictions were needed to control the spread of a more contagious variant that was first identified in Britain. Other European countries have also imposed curfews, including France, where people generally must be home by 6 p.m.The new variant, known as B.1.1.7., has been held responsible for record numbers of new cases in Britain and other European countries like Spain, which closed down its bars and restaurants last week, and Portugal, where hospitalizations have soared to record highs.

In the Netherlands, where bars and restaurants have been shut since October and schools and nonessential shops closed last month, the government has said it was “gravely concerned” about the new variant. “We don’t want to look back a few weeks from now and realize that we did not do enough,” the government said in a statement on Friday.

There have been protests against lockdown measures all through the pandemic, but none had turned as violent as the riots of the last four days. When the curfew and new travel restrictions took effect on Saturday, groups of youths set fires, attacked buildings and pelted police officers with stones.

The Dutch justice minister, Ferd Grapperhaus, said in a broadcast interview Tuesday that the protests were no reason to rethink the country’s strict lockdown measures. “We need the curfew,” he said.

The Netherlands has reported 13,686 deaths since the pandemic began, or 79 deaths for each 100,000 inhabitants — half the rate reported in countries like Britain, Belgium or Italy. The U.S. rate is about 127 per 100,000.

On Tuesday evening, soccer supporters in the cities of Den Bosch and Maastricht patrolling the streets said they were trying to prevent looting and clashes, according to a New York Times photographer and reports on social media.

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Ecuador’s erratic vaccine rollout has already led to conflict of interest accusations against the health minister.

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A healthcare worker receiving a dose of the Pfizer-BioNTech coronavirus vaccine at the military hospital FFAA in Quito, Ecuador, last week.Credit...Johanna Alarcon/Reuters

Less than a week after the government of Ecuador began a pilot program for coronavirus inoculations, health care workers say that despite officially stated priorities, vaccine doses are being given to people who are not frontline responders.

A plane carrying 8,000 doses of the Pfizer-BioNTech vaccine landed to applause in Quito on Wednesday before flying to Guayaquil. Already, at least two people at a large public hospital in the capital — a medic and a press officer — were fired after receiving doses they were not supposed to receive.

Elsewhere at the largest public hospital in Cuenca, the country’s third largest city, frontline responders staged a brief protest on Monday after learning only 13 of the 100 workers who directly treated Covid-19 cases there had received a vaccine. The list of eligible people at the hospital, called Vicente Corral Moscoso, instead gave priority to staff members such as the general manager, ear and nose doctors, pediatricians, epidemiologists and even a plastic surgeon.

The country’s health minister has ordered an investigation into the hospital’s vaccine distribution. But the Health Minister himself, Juan Carlos Zevallos, was accused on Monday of sending vaccine doses from the pilot program to a nursing home of a wealthy private hospital, where some of his relatives live. The program’s plan had originally stated that doses were to be given only to frontline responders and the elderly residents and caretakers at public nursing homes.

In an interview with a local newspaper, Mr. Zevallos admitted sending the doses to the private facility. He said people working and living in private facilities also “had a right” to get the vaccine.

The country’s ombudsman, Freddy Carrión, sent a letter to President Lenín Moreno on Monday demanding that Mr. Zevallos be dismissed. Mr. Carrión said his office was concerned over “the irregularities and lack of transparency” in the first stage of the vaccine rollout, and voiced his concerns about the lack of public access to the vaccination plan and to information throughout the entire pandemic. As of Tuesday morning, the Health Ministry and Mr. Zevallos had not returned requests for comment.

The arrival of coronavirus vaccines in Ecuador — and specifically in Guayaquil, where the plane was received by Mr. Moreno, the health minister and local health care workers — was a hefty symbolic moment. The large port city was struck hardest by the pandemic after the first positive case was confirmed in Ecuador on February 29. The following months plunged the city into horror: thousands were dying, and hospitals and funeral parlors were so overwhelmed that corpses were left for days in housesand morgues and even on sidewalks, before they were picked up. Some have never found their loved ones’ bodies. Since the holidays and the discovery that a more contagious variant had entered the country as early as mid-December, cases have again surged.

Germany’s government denies reports that the AstraZeneca vaccine is ineffective.

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A patient receiving an injection of the Oxford-AstraZeneca vaccine in Brighton, England, on Tuesday.Credit...Ben Stansall/Agence France-Presse — Getty Images

Germany’s Health Ministry has denied widely criticized and thinly sourced reports in local news outlets that AstraZeneca’s coronavirus vaccine is barely effective in protecting older people, stressing that the data was still being reviewed as European Union regulators consider approving the vaccine.

“The German Ministry of Health cannot confirm recent reports of reduced efficacy of the AstraZeneca vaccine,” the ministry said in a statement on Tuesday, after two leading German newspapers reported that the vaccine had proved effective in just 8 percent of people over 65.

“At first glance, it appears that two things have been confused in the reports: About 8 percent of the subjects in the AstraZeneca efficacy trial were between 56 and 69 years of age, and only 3 to 4 percent were over 70 years of age,” the ministry said. “However, this does not imply an efficacy of only 8 percent in seniors.”

The German health minister, Jens Spahn, called the reports “speculation” early Tuesday and pointed out that the available data had not yet been fully assessed.

“It has long been clear — there was a discussion in the fall — that there is less data for older people,” Mr. Spahn said.

AstraZeneca refuted the initial reports in the German media on the effectiveness of the vaccine, calling them “completely incorrect.” AstraZeneca and Oxford, which developed the vaccine, have not released figures on how effective the vaccine is for different age groups.

The AstraZeneca vaccine has been approved for emergency use in several countries, including Britain, India and Mexico, but not yet in the European Union. The company applied for authorization on Jan. 12, and the European Medicines Agency, the bloc’s drug regulator, is expected to announce its decision on Friday.

The reports come amid growing concern in Germany over the sluggish start to the country’s mass vaccination program, after AstraZeneca informed Brussels on Friday that it would not be able to deliver the anticipated number of doses to the European Union, because of slow production at a manufacturing site within the bloc.

Chancellor Angela Merkel and Mr. Spahn have pledged to make vaccines available by Sept. 21 to all adults in Germany who want the shot. That promise is dependent on the country receiving the 56.2 million does of the AstraZeneca vaccine, based on its original delivery pledge.

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At Salisbury Cathedral, a vaccination backed with an organ recital.

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The cathedral in Salisbury, England, is also a vaccination center.Credit...Tom Jamieson for The New York Times

On a recent Saturday afternoon, Margaret Drabble, 83, sat beneath the soaring arches of Salisbury Cathedral, swinging her legs back and forth under her chair like a schoolgirl.

Minutes earlier, in a booth near the cathedral’s entrance, she had received her first shot of the Pfizer-BioNTech vaccine against the coronavirus. But that wasn’t why she was looking so happy, she said. Instead, it was from the elaborate organ music gently reverberating in the cathedral’s interior.

“Oh, I just love the organ,” said Ms. Drabble, a former schoolteacher. “It’s so beautiful, it almost makes me cry every time I hear it.”

“I’ve always wanted to play it,” she said, wistfully. Then, she looked toward the organ’s 4,000 pipes at the front of the cathedral and sat up straight to listen. She had been told to stay put for 15 minutes, to make sure she did not develop an allergic reaction.

Britain is in the middle of a mass vaccination drive, racing to outrun the spread of the virus as a new variant discovered in the country surges. So far, some 6.3 million people have received a first dose, just under 10 percent of the population.

England’s National Health Service has signed contracts with dozens of large venues that will operate as vaccination centers. On Monday, it announced 33 new locations, including a soccer stadium in Oxford, several sports centers and a concert arena.

Patients have been getting the vaccine at Salisbury Cathedral since Jan. 16, and it hosts the inoculation sessions twice a week for around 1,200 people a day. Sessions last about 12 hours, and, for most of that time, David Halls and John Challenger, the cathedral’s organists, provide a musical backing, ranging from well-known hymns to fairground tunes and euphoric classical works.

That makes the cathedral one of the few places in the country one can hear live music right now. With much of Britain under lockdown restrictions for the third time, theaters, museums and concert halls have been forced to shut. But in recent weeks, the British government’s race to vaccinate its population has provided some cultural venues with a surprising lease on life.

“I live locally, and we’ve all been saying, ‘Have you been to the organ recital yet?’” said Pam Scoop, 86. “We don’t say, ‘Have you been for a jab?’” she added, using a British term for a shot.

A moment of peace for Mona Lisa, and an opportunity for the Louvre.

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There are no tourists in the Louvre, but its galleries are abuzz with restoration and maintenance work. Credit...Dmitry Kostyukov for The New York Times

The Louvre, the world’s most visited museum, is grappling with its longest closure since World War II, as pandemic restrictions keep its treasures under lock and key. But with the crowds gone, museum officials are seizing the opportunity to undertake a grand restoration and cleanup.

“For some projects, the lockdown has allowed us to do in five days what would have previously taken five weeks,” said Sébastien Allard, the general curator and director of the Louvre’s paintings department.

A small army of around 250 artisans has been working since France’s latest restrictions went into effect on Oct. 30. Some of the work is relatively simple, like dusting the frames of nearly 4,500 paintings. Some is herculean, like makeovers in the Egyptian antiquities hall and the Sully Wing. Nearly 40,000 explanatory plaques in English and French are being hung next to art works.

Even before the pandemic, the Louvre was taking a hard look at crowd management because mass tourism had meant many galleries were choked with tour groups. While travel restrictions have slashed the number of visitors, which hit a record 10 million in 2019, the museum will limit entry to ticket holders with reservations when it reopens to meet health protocols.

“At the moment we have so many question marks — it’s hard to know what the situation will be in two, three or four months,” Mr. Allard said.

“But despite Covid, we continue to work as always,” he continued. “We must be ready to welcome back the public.”

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Vaccine drives of the past offer insight for the current pandemic.

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Edward Jenner inoculating a child against smallpox in 1796, using pus taken from the hand of a milkmaid.Credit...Getty Images

Scientists developed vaccines less than a year after Covid-19 was identified, a reflection of remarkable progress in vaccine technology. But progress in vaccine distribution is another story.

Many questions about inoculation programs that arose decades ago are still debated today. How should local and federal officials coordinate? Who should get vaccinated first? What should officials do about resistance in communities? Should the hardest-hit places be prioritized? Who should pay?

Some answers can be found in the successes and failures of vaccine drives over the past two centuries. We examined five such efforts, including the fights against smallpox and polio.

If you squeeze the coronavirus, does it shatter?

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A scanning electron micrograph of epithelial nasal tissue infected with coronavirus.Credit...Andrew Paul Leonard

Of all the pandemic questions bedeviling scientists, the one that Juan Perilla is asking may be among the strangest: If a shrunk-down hand were to squeeze the coronavirus, would it squish, or would it shatter?

Viruses like H.I.V. tend to be on the softer side, smooshing down like a foam ball, whereas the ones that cause influenza are more brittle, prone to cracking like an egg, said Dr. Perilla, a biophysical chemist at the University of Delaware in Newark. Coronaviruses, he suspects, are somewhere in the middle, a sort of tactile Goldilocks in the world of infectious disease.

Like many other microbes, viruses are known best as malady-toting motes of misfortune — obvious grist for biologists keen to understand the inner workings of infection. But in recent years, physicists too have joined the field, eager to decipher how viruses cobble themselves together and move from place to place despite lacking most of the machinery that enables cells to replicate and run.

Some physicists, like Dr. Perilla, are teasing apart the mechanical properties of virus particles, while others monitor the forces that bring the bits and pieces of viruses together or tear them apart. Some are even enlisting physics to design the next generation of Covid-19 treatments, whether by disrupting the forces that assemble viruses inside human cells or by creating a suite of self-replicating vaccines.

Physics and virology are now so academically intertwined that their union has acquired a formal name: virus physics (or, to some, physical virology). And the data its pioneers produce can have consequences far beyond the microbial world.

“At the end of the day,” said LaNell Williams, a virologist and physicist at Harvard University, “we’re trying to figure out what physics viruses already know.”

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The story of a Houston doctor, a vial of vaccine and a theft charge takes a twist.

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Harris County’s top prosecutor, Kim Ogg, said her office would probably take the case of Dr. Hasan Gokal to a grand jury after a judge dismissed a theft charge.Credit...Godofredo A. Vásquez/Houston Chronicle, via Associated Press

Did a doctor steal vaccine to help his friends and family jump the line? Or was he beating the clock to keep precious, perishable doses from going to waste?

Those are the two sides of the still-unfinished story of Dr. Hasan Gokal, a Houston-area physician who was accused last week of taking a vial of coronavirus vaccine from a public inoculation site he was supervising.

Citing a lack of probable cause, a Texas judge dismissed a theft charge against the doctor on Monday, but that may not be the end of the matter. Harris County’s top prosecutor, Kim Ogg, said it was likely that the case would be presented to a grand jury, which could find grounds for an indictment.

The episode is attracting attention at a time of widespread frustration in the U.S. over the slow pace and glitchy start to the nation’s coronavirus vaccination push.

Ms. Ogg’s office announced the initial charge against Dr. Gokal on Thursday, saying that he had stolen a vial containing nine vaccine doses on Dec. 29 while he was working at a vaccination site in a public park in Humble, Texas, a suburb north of Houston. Dr. Gokal was fired from his job at the county health department, according to Ms. Ogg’s office, and was charged with a misdemeanor, theft by a public servant, which is punishable by up to a year in jail and a $4,000 fine.

“He abused his position to place his friends and family in line in front of people who had gone through the lawful process to be there,” Ms. Ogg said in a statement. “What he did was illegal and he’ll be held accountable under the law.”

The doctor’s lawyer, Paul Doyle, said in a statement that Dr. Gokal was simply trying to ensure that vaccine doses that were at risk of expiring “went into the arms of people who met the criteria for receiving it.”

Mr. Doyle told The Houston Chronicle that the vial was left over at the end of the day, and that Dr. Gokal realized that because it had been opened, it was going to spoil in a few hours. Rather than let the doses go to waste, Mr. Doyle told the newspaper, Dr. Gokal offered to inoculate health workers and police officers at the site, but they either did not want it or did not need it, so Dr. Gokal administered doses to other eligible people, including his wife.

At a hearing Monday, Harris County Court-at-Law Judge Franklin Bynum found that there was insufficient cause to charge Dr. Gokal, noting that the charging document was riddled with “sloppiness and errors.”

Mr. Doyle said he planned to bring a wrongful termination lawsuit against the health department on Dr. Gokal’s behalf.

College basketball coach Rick Pitino, who pushed to delay the season, tested positive.

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Rick Pitino while coaching the Greek professional team Panathinaikos in 2019.Credit...Geeorgia Panagopoulou/EPA, via Shutterstock

Rick Pitino, the Hall of Fame basketball coach now at Iona College, said he had tested positive for the coronavirus this month, 10 days after getting his first shot of a two-dose vaccine.

Pitino, 68, told reporters on Tuesday that he had felt some symptoms during his illness, but is feeling better now and still plans to get the second vaccine shot.

He said on “The Michael Kay Show” that he believed he contracted the virus from his players, and that he tested positive on Jan. 16.

“I was vaccinated, and unfortunately it takes two weeks to probably kick in where you have 50 percent immunity, so unfortunately it didn’t work totally with me and we move on,” he said on a videoconference with reporters.

“I’m fine, I’m out of quarantine,” he added. “I was very lucky. I didn’t have the severe symptoms that many people have had and I’m ready to go.”

He told The New York Times on Tuesday night that he has since tested negative for the virus several times.

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Sanofi says it will help produce 100 million doses of Pfizer’s vaccine.

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A Sanofi facility in Val-de-Reuil, France, last year. The company has delayed its own vaccine development, but will produce doses for Pfizer.Credit...Joel Saget/Agence France-Presse — Getty Images

The French drugmaker Sanofi said on Tuesday that it would help produce more than 100 million doses of the Pfizer-BioNTech vaccine, starting this summer, in an effort to meet strong demand in Europe.

Paul Hudson, Sanofi’s chief executive, said in an interview with the French newspaper Le Figaro that the company had signed an agreement with Pfizer-BioNTech to fill and pack vials of the vaccine starting in July, at a Sanofi plant in Frankfurt near BioNTech’s German headquarters.

“We should be able to supply over 100 million doses by the end of the year, which will be destined to the European Union, and therefore in part to France,” Mr. Hudson said.

Sanofi and the British pharmaceutical company GlaxoSmithKline are working on their own Covid-19 vaccine but have announced that its rollout would be delayed to later this year because trials so far had produced an insufficient immune response among elderly participants.

“Since we are running several months late on our main vaccine, we asked ourselves how we could make ourselves useful right now,” Mr. Hudson told Le Figaro. Sanofi is also working on a second vaccine that uses an mRNA technology similar to Pfizer-BioNTech’s.

Sanofi has come under intense pressure to help produce approved vaccines, especially in France, where the company is seen as a national champion — and where its failure to rapidly produce a functioning vaccine has led to criticism of its domestic research and development policies.

France has recorded more than three million coronavirus cases during the pandemic, including an average of more than 20,000 per day over the past week, according to a New York Times database. The average number of new daily cases fell sharply last month after peaking in November, but has been slowly increasing in recent weeks.

Global Roundup

Indonesia surpasses one million cases, and other news from around the world.

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Medical workers examining a Covid-19 patient at a hospital in Bogor, Indonesia, on Monday.Credit...Adek Berry/Agence France-Presse — Getty Images

Indonesia officially passed one million coronavirus cases on Tuesday, with many hospitals near capacity even as vaccinations are underway. As in many countries, however, the true number of infections is likely to be much higher.

Indonesia, which has the world’s fourth-largest population at more than 270 million, never succeeded in containing its first wave of infections, and the daily numbers of new cases and deaths have surged to their highest levels in the past 10 days.

On Tuesday, officials reported 13,094 new cases and 336 deaths for a total of 1,012,350 cases, the highest in Southeast Asia. Indonesia is the 19th country to surpass one million cases, and among Asian nations it trails only India in the number of cases.

Dicky Budiman, an epidemiologist who studies pandemics and global health security at Griffith University in Australia, has been saying for months that Indonesia is undercounting its case numbers by a third or more.

He estimates that the country has at least 60,000 new infections each day, more than four times what the government is reporting.

“The response they give to the pandemic is not equal to the problem,” said Dr. Dicky, a former Indonesian health official.

Though Indonesia began its vaccination program almost two weeks ago, it is likely to be some time before there is a significant effect on new infections. A government spokesman said that as of Tuesday, 162,000 people had received the first of two doses of the vaccine made by Sinovac, a private Chinese company. With a population spread across thousands of islands, experts say vaccinating enough Indonesians to reach herd immunity could take a year or more.

Here’s what else is happening around the world:

  • Violent protests erupted for the third night in cities across the Netherlands, with stores looted and rocks and fireworks thrown at police officers in response to a national 9 p.m. curfew that went into effect on Saturday. In total, the police arrested more than 150 people nationwide, the police chief told the Dutch broadcaster NOS.

    Politicians echoed a similar sentiment. “What’s happening in the Dutch streets is unprecedented,” Wopke Hoekstra, the finance minister, told Dutch television on Tuesday. Ferd Grapperhaus, the justice minister, called the violence “outrageous” and indicated that the protests were no reason to rethink the strict lockdown measures. “We need the curfew,” Mr. Grapperhaus said.

  • France announced on Tuesday that it would not delay the second dose of the Pfizer-BioNTech vaccine to quickly maximize the number of people receiving a first shot, as some countries have done. The French health minister, Olivier Véran, said at a news conference that the debate on delaying the second dose was “legitimate” but that it was still unclear how efficient the vaccine would be if administered six weeks after the first shot, instead of the recommended three to four weeks. “I am choosing the security of confirmed data,” Mr. Véran said.

  • A World Health Organization panel of experts recommended on Tuesday that the Moderna Covid-19 vaccine be given in two doses spaced 28 days apart, which could be extended under exceptional circumstances to 42 days. The guidance was issued by the organization’s Strategic Advisory Group of Experts on Immunization several weeks after it issued similar guidance on the rival Pfizer shot, according to Reuters.

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The E.U. escalates a fight with AstraZeneca over botched vaccine deliveries.

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The European health commissioner, Stella Kyriakides, speaking at the European Commission headquarters in Brussels on Monday.Credit...Pool photo by John Thys

The European Union escalated a war of words with AstraZeneca on Monday over the company’s sudden announcement on Friday that it would have to drastically cut the number of vaccine doses delivered to the bloc and its 27 members.

The European health commissioner, Stella Kyriakides, said a call with the company’s leadership on Monday had not yielded sufficient answers as to why the company was breaking its contractual obligation and said another call would be held on Monday evening.

A spokesperson for AstraZeneca, said: “Our C.E.O. Pascal Soriot was pleased to speak with the Commission President Ursula von der Leyen earlier today. He stressed the importance of working in partnership and how AstraZeneca is doing everything it can to bring its vaccine to millions of Europeans as soon as possible.”

The AstraZeneca debacle delivers a serious blow to the bloc’s sluggish vaccination rollout, and comes days after Pfizer notified E.U. members and several other countries that it would slow down deliveries until mid-February as it upgraded its Belgium factory to increase production.

The twin disappointments have left several E.U. countries hamstrung, and have thwarted the bloc’s collective effort to vaccinate 70 percent of its population by this summer, as Britain and the United States are making better progress with their inoculation programs.

“The European Union has pre-financed the development of the vaccine and its production, and wants to see the return,” Ms. Kyriakides said, implying that the E.U. was concerned the company had sold the vaccines the bloc had funded to other countries.

“The European Union wants to know exactly which doses have been produced, where by AstraZeneca so far, and if, or to whom, they have been delivered,” she added.

Ms. Kyriakides also said that the European Commission, the executive branch of the E.U., was proposing its members approve a system in which pharmaceutical companies like AstraZeneca that produce vaccines in plants in E.U. territory would need to register any intention to export part of that production outside the bloc.

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