Covid Live Updates: Times Square Keeps New Year’s Celebration, but With a Smaller CrowdCovid Live Updates: Times Square Keeps New Year’s Celebration, but With a Smaller Crowd

Mayor Bill de Blasio said only 15,000 would be allowed to celebrate and masks will be required. Omicron has driven virus cases past Delta’s peak in the United States.

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Mayor Bill de Blasio at a news conference last week in Prospect Park, Brooklyn. He announced on Thursday that the Times Square celebration would go on, but with far fewer spectators.Credit…Dave Sanders for The New York Times

New York City will scale back the Times Square New Year’s Eve celebration as the Omicron variant spreads, Mayor Bill de Blasio announced on Thursday, the same day New York state reported its highest recorded daily coronavirus case total ever.

The mayor added that officials were still monitoring the situation and could take additional precautions in the coming days, if needed.

As of now, attendees will be required to show proof of full vaccination and wear masks. Fewer people — 15,000, instead of the usual 58,000 — will be allowed in designated viewing areas, to make social distancing more possible. Visitors will not be allowed in until about 3 p.m., later than past years.

The number of cases in the city reported over the past week is the highest since the start of the pandemic, though testing was severely limited in its early days.

Nearly 39,000 new cases were reported statewide on Thursday, about 10,000 more thanon Wednesday, with nearly 23,000 of them in New York City. More than 60 percent of cases reported by New York State to the genetic tracking database GISAID in the last two weeks were of the Omicron variant, according to the governor’s office.

The city’s seven-day average test positivity rate was 11 percent as of Tuesday, and there were hourslong waits for tests at many sites around the city.

Also, Thursday the band Phish, which regularly plays New Year’s Eve concerts at Madison Square Garden, postponed its upcoming run of shows, including a three-set performance originally planned for New Year’s Eve.

A short while before making the Times Square announcement, at an unrelated event in Park Slope, Mr. de Blasio insisted that the rise in virus cases would subside soon and that shutdowns were not necessary. He said the city’s strategy of incentivizing vaccines and boosters and implementing strict vaccine mandates would suffice.

“It’s going to be a tough few weeks, but it will only be a few weeks,” he said, adding, “We are not falling back. We’re going to fight our way through this.”

Health experts were divided about the New Year’s Eve decision. Denis Nash, a professor of epidemiology at the CUNY School of Public Health, said that he did not think it was a good idea to hold the event.

“We’re in the middle of a pandemic with a big surge of a new variant whose risk we’re still really understanding, and I don’t think we want to let it amplify,” he said.

He added that he was concerned that people visiting New York from other states and countries could pick up the variant and bring it home with them.

“Since New York is a global city and connected to everywhere, we have to be thinking about those places too,” Dr. Nash said.

But Ashish K. Jha, dean of the Brown University School of Public Health, said that he was “really pleased” that the mayor chose not to cancel, noting the vaccine mandate and adding that the virus generally does not transmit efficiently outdoors.

“The whole country watches this, so I think psychologically it’s very important for the country to have a sense that we can do these things again and that we can do them safely,” Dr. Jha said.

The city said Thursday that spectators over 5 years old must have received both doses, if applicable, of an F.D.A. or World Health Organization-approved vaccine at least 14 days before Dec. 31.

The ball drop will take place on Mr. de Blasio’s last day in office, marking the end of his eight-year tenure. Mayor-elect Eric Adams said in a statement on Thursday that Mr. de Blasio “made the right move to take precautionary measures as we learn to live with Covid and fight the Omicron variant.”

Tom Harris, president of the Times Square Alliance, said the 15,000 number referred specifically to people who would be allowed into viewing pens. The pens will be reduced in number and will only be filled to about 25 percent capacity, he said.

A greater number of people generally watch the ball drop from the surrounding area, including from hotels, restaurants and office buildings.

“We’re really excited about welcoming revelers back,” he said. “Safety is our priority and we feel an outdoor event with fully vaccinated, masked people in a less dense environment is about as safe as we could get.”

Grace Ashford contributed reporting.

The Coalition for the Homeless said it was seeing evidence that the coronavirus was “spreading quickly” in congregate shelters and has called on Mayor Bill de Blasio to move people to hotels.Credit…John Minchillo/Associated Press

Covid-19 is surging in New York City’s homeless shelters, prompting some to call on the city’s mayor to move people to hotels to keep the fast-spreading Omicron variant from overwhelming crowded shelters.

On Thursday, the city reported that there had been 187 new cases in the past week among the 46,000 residents of the main shelter system, more than double the 82 the week before and more than quintuple the 36 cases reported for the last week of November.

The city did not say how many of those 187 cases were in the barrackslike “congregate” shelters that house 12,000 people who often sleep upward of 20 to a room.

But the operator of one such shelter said on Thursday that in recent days, 14 out of 200 residents, or 7 percent, had tested positive and that most residents had not been tested at all in the last two weeks. At least four workers at that shelter, out of about 40, had also tested positive, said the operator, who spoke on the condition of anonymity because the city forbids shelters to talk to reporters without clearance.

If 7 percent of the residents of congregate shelters got the coronavirus, that would be over 800 people, which would exceed the shelter system’s current supply of isolation and quarantine rooms. So far, though, the 187 new cases the city reported represent less than 1 percent of the overall shelter population.

The Coalition for the Homeless, an advocacy group, urged Mayor Bill de Blasio to move people from congregate shelters back to the hotels where the city placed them during the early waves of the pandemic to stem the spread of the virus.

The city’s comptroller-elect, Brad Lander, also said that by keeping thousands of people in shelters “where they cannot adequately isolate,” the city was “failing” its legal and moral obligation to “provide people who are struggling with a safe place to stay warm and sleep.”

But Mr. de Blasio said the city had no plans to move people to hotels en masse. “What we’re seeing so far in Omicron: intense surge but less impact, and we also believe it’ll be for a brief period of time,” he said on Wednesday. “So that does not suggest doing things the way we did last year.”

He added, “We also have a hell of a lot more people vaccinated than we did when we went through the challenges last year.”

At least 11,000 shelter residents have been vaccinated directly through the shelter system, in addition to an unknown but large number vaccinated elsewhere, the Department of Homeless Services said.

As of Tuesday, the shelter system had about 70 vacant beds in isolation units, where people are sent after testing positive or showing Covid-like symptoms, and about 130 beds in quarantine rooms, said Isaac McGinn, a Homeless Services spokesman. Typically, if someone in a congregate shelter tests positive, the people sleeping nearest to them are sent to quarantine. Mr. McGinn said the department was “on standby to bring on more beds pending additional needs.”

On Wednesday, Housing Works, the nonprofit that runs most of the shelter system’s isolation and quarantine units, declined to provide medical services at a new isolation hotel the city is using because the city was insisting on putting two people in a single isolation room, said Charles King, Housing Works’ executive director.

At a women’s shelter in College Point, Queens, one resident, Alison Gibney, said that three women that she knew of had tested positive in recent days.

“It’s a nightmare situation,” Ms. Gibney said. “There are 15 women to a room, and I must sleep with a mask, and that is the only time I’m not double masked.”

Covid-19 vaccines helped save lives and lower hospitalization rates; the White House is considering ways to be better capable to research and develop vaccines for the next potential outbreak.Credit…Isadora Kosofsky for The New York Times

WASHINGTON — As the Biden administration tries to stanch yet another wave of the coronavirus pandemic, senior White House officials have also been considering a proposal to ensure the nation is better prepared for the next infectious disease outbreak.

Key to the plan is the creation of a taxpayer-funded “vaccine hub” where experienced drug makers would partner with the government, reliably churning out millions of doses under federal oversight.

The proposal is partly a response to a searing failure by a once obscure Maryland biotech firm, Emergent BioSolutions. While Pfizer and Moderna had spectacular success producing vaccines, the government entrusted the manufacturing of two of the other leading candidates to Emergent, which was forced to toss tens of millions of doses of Johnson & Johnson’s vaccine and to quit producing the AstraZeneca vaccine because of serious quality problems that ultimately led the Biden administration to cancel its contract.

The government’s partnership with Emergent, which cost taxpayers hundreds of millions of dollars over the past decade, was supposed to be a pillar of the nation’s pandemic preparedness. Instead, it proved to be the culmination of 30 years of frustrations.

Three times over the past three decades, presidential administrations explored plans for a vaccine overhaul like the one President Biden is now considering, only to be thwarted by pharmaceutical lobbying, political jockeying and cost concerns, a New York Times investigation found.

In each case, the nation was left ill prepared for the next crisis — while creating a vacuum that Emergent eagerly filled.

“The reason why Emergent got so many contracts is mostly because they were the only ones willing to do the work,” said Dr. Kenneth Bernard, a top biodefense adviser to Presidents Bill Clinton and George W. Bush.

To reconstruct the forgotten history that led to this year’s vaccine debacle, The Times reviewed thousands of pages of records — among them files from presidential and military archives, previously undisclosed government reports, industry correspondence and business plans.

Reporters also interviewed more than 30 people who have helped shape U.S. biodefense policy, including officials from five presidential administrations, corporate executives and industry consultants.

Time and again, The Times found, analyses commissioned by the federal government arrived at a similar conclusion: Ensuring access to specialized vaccines is a public good that cannot be left entirely to the market; yet it is unrealistic for the government to take on the task alone.

France began vaccinating children aged 5-11 on Wednesday.Credit…Sebastien Bozon/Agence France-Presse — Getty Images

Officials in Spain said they would announce an outdoor mask mandate on Thursday, shortly after the country reported almost 50,000 new coronavirus cases, its highest daily total since the pandemic began. Catalonia, the northeastern region, is reintroducing on Friday a nighttime curfew, shuttering nightclubs and limiting gatherings to 10 people over the Christmas season.

Italy is making the country’s Covid health pass, a document that is required to work and to participate in many social activities, valid for just six months rather than nine; making masks mandatory outdoors; and banning parties or events, indoors or out, until the end of January.The country registered 44,595 new cases on Thursday — up from 33,600 on Wednesday — and 168 deaths.

Italy’s health minister, Roberto Speranza, said that the new decree was designed to counteract Omicron, a variant “with a significant capacity to increase contagion,” and would prevent unvaccinated people from entering museums, entertainment parks, exhibitions, and indoor bars and restaurants — ruling out even the Italian espresso traditionally drunk at the counter.

And Greece said on Thursday that masks would be required in all outdoor and indoor areas where they are not already mandatory, like gyms. Greece’s health minister also banned all public events until Jan. 3.

European officials hope that new restrictions and greater access to vaccines will blunt the latest rising wave of coronavirus cases reported in the days leading up to Christmas and New Year’s. Colder weather and holiday traditions are bringing people from different households together indoors, where health experts say the virus spreads most readily.

Vaccinations for children under 12 started last week in much of Europe. The French authorities said on Wednesday that they were making all children 5 to 11 eligible, and a vaccine advisory committee in Britain recommended inoculating children that age who are in certain risk groups.

Recent data from France suggests that unvaccinated children are helping drive the accelerating spread of the virus there. The incidence of infection among children aged 6 to 10 is now twice that for the population as a whole, according to a study published last week by the French health authorities. A similar pattern was seen in Italy, where schoolchildren and young adults account for the majority of recent cases, experts there said.

“Vaccination of children is a necessity,” Prime Minister Jean Castex of France said last month. “It was my 11-year-old daughter who gave me the virus a few weeks ago.”

France reported an average of 54,256 cases a day last week, according to the Center for Systems Science and Engineering at Johns Hopkins University. About 73 percent of eligible residents are fully vaccinated, according to Our World in Data.

European nations like Germany, Greece and Spain already offer pediatric vaccination doses for younger children; so does the United States.

Other countries are also expanding access to vaccines. In Turkey, where the Pfizer-BioNTech and Sinovac vaccines are already in use, government officials granted emergency-use approval on Wednesday for a domestically developed Covid vaccine known as Turkovac.

And officials are weighing more mandates. Prime Minister Mario Draghi of Italy has said the country’s vaccine requirement for health care workers may be extended. And the Vatican said on Thursday that anyone who works in Vatican City must be vaccinated or have recovered from Covid; a negative test result will no longer be accepted as an alternative.

Reporting was contributed by L?ontine Gallois, John Yoon, Yan Zhuang, Isabel Kershner, Raphael Minder and Patrick Kingsley.

Ali Kate Cherkis for The New York Times

In January, Ali Kate Cherkis set out to document the scenes of the subway as New York City came out of one of the worst moments of the pandemic. As spring trickled by and vaccinations increased, there were fewer masks and latex gloves. Summer brought a brief respite: Tourists were returning to find dollar slices and take High Line selfies, and Showtime was back.

But the city’s recovery has come in fits and starts. First, Delta arrived, and now Omicron. Subway ridership is still just slightly more than half of what it was prepandemic. We don’t know if it will ever return to the way it was.

Yet still, the city underground mirrors the city above, ridership revealing a widening disparity between those who have been fortunate enough to adapt and move forward, and those who have been left behind.

The Omicron variant, which is now dominant in the United States and spreading faster than any variant yet, has already pushed daily coronavirus case counts higher than the peak of the recent Delta wave. By most estimates, the country is in for a significant winter surge.

Although there are early positive signs out of South Africa and Britain that Omicron infections more often result in mild illness than previous variants, officials are warning that the new variant could swiftly overtax the health care system and bring significant disease to many communities.

The highly transmissible variant is causing near-vertical case growth in multiple U.S. cities, with figures doubling about every two to three days. Officials expect it to break records. The all-time high for average daily cases was 251,232, set in January. By some estimates, the United States could reach one million cases a day, even before the end of the year.

While Omicron’s speed now speaks for itself, scientists are still racing to understand its threat. Preliminary studies out of Scotland and England suggest that infections from the variant could be milder, but scientists caution that Omicron infections must be observed in the U.S. population before drawing conclusions.

Even if these early results hold and Omicron does cause mostly mild illness, the sheer magnitude of cases it causes could still escalate hospitalizations at a time when many medical centers are already full.

“When we have millions and millions and millions of people, all sick, all together at one time, it doesn’t take a large percentage of those people to topple over the hospitals,” said Dr. Hallie Prescott, associate professor of internal medicine at the University of Michigan.

And experts say not enough people are boosted, or vaccinated at all. The variant is thought to evade immunity from both vaccination and prior infection, but early research suggests that a booster provides the best protection against infection. And vaccination, even without the booster, is expected to maintain strong protection against hospitalization and death.

The Merck & Company headquarters in Kenilworth, N.J.Credit…Andrew Kelly/Reuters

The Food and Drug Administration on Thursday authorized a second antiviral pill for Covid but said it should not be a preferred treatment.

The F.D.A. cleared the pill, developed by Merck and known as molnupiravir, for adults who are vulnerable to becoming severely ill from Covid and for whom alternative Covid treatment options authorized by the F.D.A. are “not accessible or clinically appropriate.”

The F.D.A.’s decision reflects concerns that Merck’s pill is only modestly effective while also carrying the possible risk of causing reproductive harm. But in the coming weeks, it is expected to be more available in the United States than other treatment options.

Older people and those who have conditions like obesity, diabetes and heart disease would be eligible to get a prescription for Merck’s pills if they get sick from the coronavirus and cannot get treatments such as Pfizer’s newly authorized pills or monoclonal antibody treatments. Both vaccinated and unvaccinated people will be eligible.

The treatment — to be taken as 40 pills over five days — is expected to be available within a few weeks.

Even before the F.D.A.’s decision, some doctors and health officials had tempered expectations for Merck’s drug. Studies indicate that it is far less effective than Pfizer’s version, which received F.D.A. authorization on Wednesday and is expected to become more widely available in the United States starting in a few months.

In a key clinical trial, Merck’s drug reduced the risk of hospitalization or death by 30 percent when given to high-risk unvaccinated people within five days of the onset of symptoms. Pfizer’s pill was found to reduce that risk by 88 percent.

“I don’t think Merck’s version is going to be the game changer,” said Dr. Walid Gellad, director of the Center for Pharmaceutical Policy and Prescribing at the University of Pittsburgh.

Dr. Dean Li, a Merck executive, said on Thursday that preliminary preclinical studies suggest that the drug is equally as effective against the Omicron variant as it was against earlier versions of the virus. The company and independent researchers have been running laboratory experiments on how well the drug can stop the Omicron variant from replicating.

The pills from Merck and Pfizer can be taken at home and are expected to reach many more people than monoclonal antibody treatments, which are typically given via intravenous infusions by a health care provider.

Until this week, the antibody drugs have been the only authorized treatment options for Covid patients who are at high risk of becoming severely ill. But Omicron has wreaked havoc on the country’s supply of the antibodies. Some hospitals have stopped using several of the antibody drugs because they are not likely to work against Omicron, and the only potent antibody treatment remaining against the variant is in very limited supply.

Merck’s treatment — which it developed with partner Ridgeback Biotherapeutics — is expected to be in greater supply sooner than Pfizer’s. By the end of January, Merck is expected to make available to the federal government enough pills for 3.1 million people, at a cost of about $700 a person. The first 378,000 treatment courses are expected about two weeks after authorization.

Pfizer is expected to supply before the end of January enough of its product, known as Paxlovid, for 265,000 people in the United States. Initial supplies are expected in the next few days.

To get Merck’s pills, the F.D.A. said, patients will need to test positive for the virus and get a prescription from a health care provider, all no more than five days after symptoms start.

Merck’s pill works by introducing errors into the virus’s genes to stop it from replicating, which has raised concerns about the risk that it could cause reproductive harm.

The F.D.A. said that women who were pregnant should generally not take the pills, but that there could be exceptions. The agency said that women who may become pregnant should use contraception while taking the pills and for at for at least four days after. The male partners of women who could become pregnant should use contraception while taking the pills and for at least three months after, the agency said.

Morgan Van Ancken gets tested in Brooklyn on Wednesday.Credit…Janice Chung for The New York Times

Testing is essential to stopping the spread of Omicron. But nearly two years into the pandemic, many people are still confused about the best way to get tested for Covid-19, or frustrated that they can’t find a test.

We asked public health experts for answers to some common questions about coronavirus testing during the Omicron surge.

When is the best time to take a rapid home test before seeing family for the holidays?

Home tests can tell you whether you are infected with coronavirus right now. So you should test as close as possible to the time of the gathering, preferably about an hour or two before everyone gets together, advises Dr. Ashish K. Jha, dean of the Brown University School of Public Health.

Dr. Michael Mina, a former Harvard epidemiologist who is now the chief science officer for eMed, a company that distributes at-home tests, advises an even tighter window. He suggests you take the test in your car just 15 minutes before the event, if that’s practical.

A negative test does not lower your risk to zero. But taking a test does significantly reduce the risk of transmission. “A test will not protect you from getting infected,” said Dr. Mina. “A test will protect you from infecting other people.”

If you’re flying, or taking a train, you should test the day you travel to make sure you’re not infecting your fellow passengers. Once you arrive, you should test in two or three days.

What if I can’t find home tests before the holidays?

The most important precaution is that everyone at a gathering who is eligible be fully vaccinated and have a booster shot. But since even vaccinated people can spread Omicron, rapid testing a few hours before an event can prevent an infected person from unknowingly spreading the virus.

If you can’t find rapid home tests, try to get a lab test as close as possible to the event, timing it so you get the results back before you see everyone. “Any test is better than no test,” said Mara Aspinall, an expert in biomedical diagnostics at Arizona State University who is also on the board of OraSure, which makes rapid Covid tests.

Limit other activities and try to isolate as you wait for the lab results so you don’t get infected in the interim.

If everyone at the party can’t get tested, then you’ll need to assess the risk. If a vulnerable person — someone very old or who has significant health risks — will be at the party, you may decide to scale it back or cancel.

When is the best time to test if I was exposed to an infected person?

Many public health experts say people with potential exposures to the Omicron variant should test sooner than advised for previous variants.

A recent outbreak of Omicron infections in Norway after a holiday office party in November gives us clues about the best time to test based on how quickly an Omicron exposure can “convert” to an infection, said Dr. Wachter. The party was held in a restaurant on a Friday, and everyone was vaccinated. Of 80 confirmed and suspected cases, nearly 75 percent were detected on the Sunday, Monday and Tuesday after the party. That suggests that the best times to test are on days 2, 3 and 4 after exposure.

People in Miami waited in line Tuesday to be tested for the coronavirus. Demand for tests has surged recently as the Omicron variant has spread and the holidays have approached.Credit…Saul Martinez for The New York Times

As Americans prepare for out-of-state travel and multigenerational indoor gatherings over the holidays, many people who need to get tested for the coronavirus are running into shortages, long lines and other deterrents — while many others are avoiding getting tested altogether.

“The fact they’re hard to come by suggests that there is a portion of people who really do put a lot of confidence in these tests,” said Preeti Malani, a professor and chief health officer at the University of Michigan. “But are the people who most need to be tested being tested?”

As the government has concentrated mainly on pushing more people to get vaccinated, she said, testing remains “not anywhere near where it needs to be.”

A forthcoming study in South Carolina suggests that some of the same groups that were slow to embrace vaccination are also less likely than others to get tested, often for reasons like mistrust of the medical system or fear of missing work and wages if they test positive.

When people are willing to take a test, there is often confusion about when to do it, what to do while waiting for results and what a negative reading does and does not signify.

“Tests can’t see what’s in the future,”said Gigi Gronvall, a professor at the Johns Hopkins Center for Health Security. “Some people look at it as a get-out-of-jail-free card, when in fact it’s just a moment in time.”

States, businesses and religious groups have challenged a Biden administration rule requiring larger businesses to mandate vaccines or weekly testing for employees.Credit…Gabby Jones for The New York Times

The Supreme Court said on Wednesday evening that it would hold a special hearing next month to assess the legality of two initiatives at the heart of the Biden administration’s efforts to address the coronavirus in the workplace.

The court said it would move with exceptional speed on the two measures, a vaccine-or-testing mandate aimed at large employers and a vaccination requirement for certain health care workers, setting the cases for argument on Friday, Jan. 7. The justices had not been scheduled to return to the bench until the following Monday.

Both sets of cases had been on what critics call the court’s shadow docket, in which the court decides emergency applications, sometimes on matters of great consequence, without full briefing and argument. The court’s decision to hear arguments on the applications may have been a response to mounting criticism of that practice, Adam Liptak reports for The New York Times.

The more sweeping of the two measures, directed at businesses with 100 or more employees, would affect more than 84 million workers and is central to the administration’s efforts to address the pandemic. The administration estimated that the measure would cause 22 million people to get vaccinated and prevent 250,000 hospitalizations.

The second measure requires health care workers at hospitals that receive federal money to be vaccinated against the virus. It “will save hundreds or even thousands of lives each month,” the administration wrote in an emergency application.

The Supreme Court has repeatedly upheld state vaccine mandates in a variety of settings against constitutional challenges. But the new cases are different, because they primarily present the question of whether Congress has authorized the executive branch to institute the requirements.

The answer will mostly turn on the language of the relevant statutes, but there is reason to think that the court’s six-justice conservative majority will be skeptical of broad assertions of executive power.

The last time the Supreme Court considered a Biden administration program addressing the pandemic — a moratorium on evictions — the justices shut it down.

“Our system does not permit agencies to act unlawfully even in pursuit of desirable ends,” the court said in August in an unsigned opinion, over the dissents of the three liberal justices.

The vaccination-or-testing requirement for large employers was issued in November by the Labor Department’s Occupational Safety and Health Administration, or OSHA.

Employers are allowed to give their workers the option to be tested weekly instead of getting the vaccine, though they are not required to pay for the testing. The rule makes an exception for employees who do not come into close contact with other people at their jobs, like those who work at home or exclusively outdoors.

Under a 1970 law, OSHA has the authority to issue emergency rules for workplace safety, provided it can show that workers are exposed to a grave danger and that the rule is necessary.

States, businesses and religious groups challenged the measure in appeals courts around the nation, and a unanimous three-judge panel of the U.S. Court of Appeals for the Fifth Circuit, in New Orleans, had ruled in favor of some of the challengers, blocking the measure.

Last week, after the challenges were consolidated before the U.S. Court of Appeals for the Sixth Circuit, in Cincinnati, a divided three-judge panel reinstated the measure.

Almost immediately, more than a dozen challengers asked the Supreme Court to block the measure. READ THE FULL ARTICLE ->

A man receiving the AstraZeneca Covid-19 vaccine as a booster dose at a hospital in Phnom Penh, Cambodia, in August.Credit…Cindy Liu/Reuters

In laboratory tests, a booster dose of the Oxford-AstraZeneca coronavirus vaccine raised antibody levels enough to suggest that it may offer protection against the Omicron variant, AstraZeneca reported on Thursday, citing an independent study by researchers from the University of Oxford.

Tests using samples taken from 41 people one month after receiving a third AstraZeneca shot showed that the neutralizing antibodies needed to prevent infection from the virus were at levels similar to those observed after a second dose against the Delta variant.

“These results support the use of third-dose boosters as part of national vaccine strategies, especially to limit the spread of variants of concern, including Omicron,” Prof. Sir John Bell, one of the investigators in the study, said in a statement.

The study has not been peer-reviewed. More research would be needed to determine whether the results seen in the laboratory translate into real-world effectiveness.

The study follows findings from Pfizer-BioNTech and Moderna, which reported that third doses of their vaccines had initial success at stopping infection and severe illness from Omicron.

Vaccines from all three companies have been authorized as “safe and effective booster doses” by Britain’s Medicines and Healthcare Products Regulatory Agency. Britain’s booster campaign has been built around Pfizer-BioNTech and Moderna doses, but people who cannot get one of them can receive an AstraZeneca booster, according to the National Health Service.

The study comes on the heels of a real-world effectiveness study published by British government scientists last week that found that after six months, the regular two-dose AstraZeneca vaccination alone offered little to no protection against Omicron infection, though it still helped prevent serious disease from the variant. Giving people who started with two doses of AstraZeneca a Pfizer booster dose increased the effectiveness against symptomatic infection from the variant to 71 percent, the study found.

A growing body of preliminary research has indicated that most of the world’s vaccines provide protection against serious illness from Omicron. But many of them, including those manufactured in China or Russia as well as the Johnson & Johnson vaccine, seem to do little or nothing to stop the variant’s spread.

Three doses of the Chinese vaccine Sinovac offer almost no protection from Omicron infection, researchers in Hong Kong said in a study released on Wednesday. Sinovac is one of the most widely used vaccines in China, as well as in low- and middle-income countries like Mexico and Brazil.

Jesse Watters urged his viewers to “ambush” Dr. Anthony S. Fauci with adversarial questions about the pandemic. Credit…Jeenah Moon for The New York Times

The Fox News host Jesse Watters used notably violent language this week in urging a gathering of conservatives to publicly confront Dr. Anthony S. Fauci, the nation’s foremost infectious-disease specialist, who has become a frequent source of criticism on the political right.

Referring to tabloid-style surprise interviews, Mr. Watters said in a speech that activists should “ambush” Dr. Fauci with adversarial questions that he deemed “the kill shot.” Describing the imagined effect of such a filmed confrontation, Mr. Watters added: “Boom! He is dead! He is dead! He’s done!”

Dr. Fauci called the comments “horrible” in an interview with CNN and said Mr. Watters “should be fired on the spot.”

Fox News has not disciplined Mr. Watters for the remarks. The network said in a statement that the comments were “twisted completely out of context” and that “it’s more than clear that Jesse Watters was using a metaphor for asking hard-hitting questions to Dr. Fauci.”

The host’s amped-up language was in keeping with the tone of prominent conservative figures, who for months have routinely and casually referred to Dr. Fauci in bracingly derogatory terms.

Senator Ted Cruz, Republican of Texas, for instance, described Dr. Fauci as “the most dangerous bureaucrat in the history of the country” during a Fox News interview last month.

Mr. Watters has gone about his job as usual since the uproar over his remarks, which he made on Monday.

Sheryl Gay Stolberg contributed reporting.

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