Covid-19 and Vaccine News: Live Updates

Note: As of March 13, 2021. Source: Transportation Security Administration, analysis by Kevin Williams

American air travel has been picking up, but it is the small, regional, vacation-destination airports that are thriving a little more than a year after the pandemic, while large hub airports have just a fraction of the travelers they did at this time last year, detailed new data shows.

Big-city airports, including those in San Francisco, Portland and Seattle are serving between 24 percent and 46 percent of their typical traveler volume. Washington National, close to the District of Columbia, is down 70 percent in passenger volume, and Kennedy Airport in New York is serving about one-third of its normal volume, according to data from the Transportation Security Administration analyzed by Kevin Williams, a Yale economist who studies air travel.

Smaller regional airports, including those near Jackson Hole, Wyo., and Colorado ski country, have passenger volume as much as 12 percent higher than this time last year. And these airports appear to fall into two categories: those especially close to outdoor vacation destinations, and those serving communities whose residents are more willing to travel amid a pandemic.

The Centers for Disease Control and Prevention continues to advise that people refrain from widespread travel for the time being, while the agency works on travel guidance.

The current guidance addresses local gatherings where fully vaccinated people — now about 16 percent of the total U.S. population — return to some activities in small private settings with other fully vaccinated people, or a fully vaccinated household with one other unvaccinated household. Fully vaccinated people, the agency said, should keep following health and safety precautions in public, including wearing a mask.

But with millions of Americans getting vaccinated each day, and many states rolling back 2020-era restrictions, the drive to return to somewhat normal lifestyles is growing.

Already, some destinations, cruise lines and venues are requiring travelers to provide a C.D.C. vaccination card as proof that they have been inoculated against Covid-19. And there is great interest in a “vaccine passport” that would make vaccination status easy to share digitally.

The Biden administration has stayed clear of such initiatives, leaving the matter to the private sector instead.

“What’s important to us — and we’re leading an interagency process right now to go through these details — are that some important criteria be met with these credentials,” including equitable access and privacy and security concerns, Andy Slavitt, the acting director for the Centers for Medicare and Medicaid Services, said recently.

Receiving the first dose of a vaccine in Detroit. More than 2,200 coronavirus patients in Michigan are hospitalized, a figure that has more than doubled since the beginning of March.
Credit…Cydni Elledge for The New York Times

Americans have entered a disconcerting phase of the pandemic.

They are awash in hopeful news: With more than 2.8 million shots on average being administered every day, the country is fast approaching universal vaccine eligibility for all adults.

And then there are problems like Michigan.

In a rural stretch of the state along the shore of Lake Huron, coronavirus outbreaks are ripping through churches, schools and restaurants. For more than a week, ambulances have taken several hourlong trips each day to rush Covid-19 patients to I.C.U.s in Detroit, Port Huron or Saginaw.

Even as the pandemic appears to be waning in some parts of the United States, Michigan is in the throes of one of the most alarming outbreaks in the country.

“I never thought we would see this at this time — I thought we would be over the hump,” said Ann Hepfer, a health officer for two counties.

For all the encouraging developments, Americans are getting increasingly ominous warnings about the national picture from public health officials.

On Monday, Dr. Rochelle Walensky, the director of the Centers for Disease Control and Prevention, said she felt a sense of “impending doom” about a potential new surge in cases. President Biden said states should pause their reopening efforts, warning that the country is “giving up hard-fought, hard-won gains.”

Cases, deaths and hospitalizations remain well below the peak levels seen in January. But infection numbers have started rising again, to about 66,000 a day, fueled mostly by pervasive outbreaks on the East Coast and in the Upper Midwest.

The country is a study in contrasts.

Connecticut, New Jersey, New York and other states in the Northeast continue to report high levels of cases, and troubling upticks have emerged in Illinois, Minnesota and some other Midwestern states. But in much of the South and West, case numbers remain relatively low.

California is reporting continued declines, Arizona is averaging about 550 cases a day, down from more than 10,000. And in Arkansas, fewer than 200 cases are being announced most days, down 40 percent in the last two weeks.

But if any place offers a glimpse at the threat of a new surge, it is Michigan.

More than 2,200 coronavirus patients statewide are hospitalized, a figure that has more than doubled since the beginning of March. On Monday, the health system announced that it would reinstate a policy limiting visitors at several hospitals, in response to the latest surge.

Health officials partly attributed the rapid rise in cases to the variant originally identified in Britain, called B.1.1.7, which is widespread in Michigan.

But they have also observed a broader return to prepandemic life seen in a relaxing of mask wearing, social distancing and other strategies meant to slow the spread of the virus — many weeks before a substantial portion of the population is vaccinated.

“It is absolutely alarming,” Emily Toth Martin, an epidemiologist at the University of Michigan School of Public Health, said this week. “Looking at numbers yesterday felt like a gut punch. We’re going to have to go through this surge, and all this hard work again to get the numbers down.”

Preparing syringes with the Pfizer-BioNTech vaccine during a mass vaccination drive in Schwaz, Austria, last month.
Credit…Johann Groder/Agence France-Presse — Getty Images

An updated analysis of clinical trial data shows that the Pfizer-BioNTech coronavirus vaccine continues to offer strong protection without serious safety concerns, the companies said on Thursday.

The new data also suggested that the vaccine works against a worrisome virus variant in South Africa, although more studies are needed, experts said.

Pfizer and BioNTech made the announcement in a news release. The data have not been peer-reviewed nor published in a scientific journal.

Dr. Albert Bourla, Pfizer’s chief executive, said in a statement that the new data “confirm the favorable efficacy and safety profile of the vaccine” and will allow the companies to submit an application to the Food and Drug Administration for full approval. At the moment, the vaccine has received only an emergency authorization from the agency.

The new analysis is an update to data gathered in the more than 44,000-person clinical trial that led to the authorization in the United States and in other countries in December. Pfizer and BioNTech have now recorded 927 cases of Covid-19 among participants in the study, and the new analysis finds that the vaccine is more than 91 percent effective after the second dose, given three weeks after the first.

In November, the companies said that the vaccine was 95 percent effective, a figure based on some 170 Covid-19 cases reported among participants. The new analysis found the vaccine was nearly 100 percent effective in preventing severe disease and death, as was the case in November.

More than 12,000 people who received the vaccine in the trial have passed the six-month mark since the second dose, and no new safety issues were identified, company researchers also said. The companies did not provide specific efficacy data for that group.

A virus variant first identified in South Africa has particularly worried scientists, because it carries mutations that could prevent vaccines from working as well as they do against the original coronavirus. Trials of other vaccines in South Africa, such as those developed by Johnson & Johnson and AstraZeneca, have shown that they are less effective against the so-called B.1.351 variant circulating there.

Pfizer and BioNTech said that among 800 trial participants in South Africa, all nine of the observed Covid-19 cases occurred in those who had received a placebo. Six were infected with the B.1.351 variant, suggesting that the vaccine had worked successfully to block that virus.

The companies have already announced plans to test the effectiveness of a third shot, and are also beginning a clinical trial of a new version of the vaccine that was developed specifically to target B.1.351. Moderna — which, like Pfizer and BioNTech, makes a vaccine based on the mRNA platform — and other companies have announced similar plans.

Natalie Dean, a biostatistician at the University of Florida, said the small number of cases in South Africa made it difficult to interpret the results. And she noted that in the United States, where variants are not yet as widespread, the new analysis concluded that the Pfizer-BioNTech vaccine was nearly 93 percent efficacious, compared to the initial estimate of 95 percent in November.

Dr. Dean said that she would need to see more details of the analysis to make any firm conclusions about that discrepancy. “Some wiggle is expected in the final estimate, so I don’t want to overstate this change,” she said.

Pfizer and BioNTech declined to provide further details.

On Wednesday, the companies reported that a clinical trial had shown their coronavirus vaccine was almost 100 percent effective in adolescents aged 12 to 15, and caused no serious side effects. That data, too, has not yet been peer-reviewed nor published in a journal.

Getting the Moderna vaccine in Richmond, Va., last month.
Credit…Carlos Bernate for The New York Times

Virginia said it would allow residents 16 or older to begin getting vaccinated against Covid-19 on April 19, joining more than 40 states that have sped up efforts to open the process to all adults as federal health officials warn about a possible fourth surge of the coronavirus.

“The Covid-19 vaccine is the light at the end of the tunnel,” Gov. Ralph Northam said in a statement. “And that light is getting brighter every day, as more and more Virginians get vaccinated.”

Inoculation efforts in the United States have sped up as states push to make more adults eligible, heeding a call from the president to rapidly expand eligibility. As of Wednesday, an average of 2.83 million shots a day were being administered across the country, according to data reported by the Centers for Disease Control and Prevention. About 31 percent of Virginia’s total population has gotten at least one shot, putting it in the top 20 states, according to a New York Times analysis of C.D.C. data.

On Monday, President Biden ordered his coronavirus response team to ensure that by April 19 there would be a vaccination site within five miles of 90 percent of Americans’ homes. It builds on his plan for states to open eligibility to all adults by May 1.

The number of Americans, in particular Black Americans, who have been vaccinated or want to to get a shot has risen significantly since January, according to a poll by the Kaiser Family Foundation. Republicans and white evangelical Christians continue to be skeptical of getting a virus vaccine, according to the survey.

A cafe in Palma, Majorca, on Tuesday. The Spanish government has now ordered the mandatory wearing of face masks in all public outdoor spaces, including beaches.
Credit…Enrique Calvo/Reuters

MADRID — In the prelude to Easter, some in Spain are lamenting what they see as a double standard in restrictions to contain Covid-19. The polemic is echoed in other European countries, where the authorities have also tightly restricted domestic travel while allowing their citizens to go abroad and permitting foreign tourists to enter and move about more freely.

The back-and-forth over the rules reflects the difficult balancing acts for European governments trying to blunt the pandemic while keeping their economies afloat, particularly when it comes to the tourism revenues that are so critical to countries like Italy and Spain. After seven years of consecutive growth in tourism arrivals, Spain welcomed 19 million people last year, down from almost 84 million in 2019.

The Spanish government has defended its approach, stressing that visitors from most other countries do not present the same health risks as residents on the move because they must test negative for Covid-19 before traveling. But local residents do not have the option to move around the country, even if they have tested negative, for leisure.

The European Commission, the executive arm of the European Union, introduced plans recently to create a digital certificate that could ease tourism this summer, including internal travel within member states.

“Given that transmission and risk are similar for national and cross-border journeys, member states should ensure there is coherence between the measures applied to the two types of journey,” said Christian Wigand, a commission spokesman.

Opposition politicians in Spain seized on those comments. Some were already accusing the authorities of favoring tourists over residents seeking an Easter getaway.

María Jesús Montero, a minister and spokeswoman for the Spanish government, said last week that the country was doing exactly the same as others in allowing foreign travel but limiting domestic movement.

Italy also has tough rules in place restricting movement across the country. Residents are allowed to leave their town — or their house in the more affected regions — only for work, health reasons or other reasons deemed necessities.

But the government has allowed Italians to travel for tourism to most European countries, including France, Germany and Spain, only asking them to get a negative test 48 hours before their return.

A spokesman for Italy’s health minister said the risk of contagion from international travel with restrictions was lower than that of allowing free movement between domestic regions. One reason for that, he said, is volume — it is easier and cheaper for large numbers of people to travel domestically — adding that it would also be virtually impossible to enforce quarantines on travel between regions.

The Italian hotel association, Federalberghi, was among those accusing the government of double standards.

“Hotels and all the Italian hospitality system have been stuck for months because of the ban on moving from one region to another,” Bernabò Bocca, the president of Federalberghi, said on Sunday. He added, “We do not understand how it is possible to authorize travel across the border and ban it within Italy.”

Fans watching the Milwaukee Brewers play the Texas Rangers in a preseason baseball game at Globe Life Field in Arlington, Texas, on Monday.
Credit…Tony Gutierrez/Associated Press

President Biden said on Wednesday that the Texas Rangers’ decision to open their 43,000-seat stadium to full capacity was “not responsible” and urged Major League Baseball fans to wear masks and abide by social distancing protocols as the season begins.

“I think it’s a mistake,” Mr. Biden said of the Rangers’ plan.

“They should listen to Dr. Fauci and the scientists and the experts,” he said, referring to Dr. Anthony S. Fauci, the nation’s leading infectious disease expert. “But I think it’s not responsible.”

Speaking to ESPN the night before Opening Day, when all 30 M.L.B. teams will be in action, Mr. Biden sounded a cautious note for fans as coronavirus cases are on the rise in much of the country.

After a pandemic-shortened 2020 season, the league plans to play a full 162-game schedule with fans allowed at every game. While fans will be required to wear masks at every ballpark, policies differ based on rules in force in the city or state.

After Texas lifted coronavirus capacity restrictions in early March, the Rangers said they would allow capacity crowds at home games — the only M.L.B. franchise to do so. Fans appear to be wary. Only 12,911 spectators showed up to a Rangers exhibition game on Monday at Globe Life Field in Arlington.

Dr. Fauci said in a recent interview with the CBS program “Face the Nation” that he expected the restrictions on fans to lessen as the baseball season progressed.

But while fans may flock to stadiums on Thursday, Mr. Biden will not be throwing the first pitch at any ballparks for now.

“I know the president is eager to get out to Nationals Stadium” in Washington, Jen Psaki, the White House press secretary, said on Tuesday. “Many beautiful days, many beautiful baseball games ahead this spring.”

Administering a shot in Piacenza, Italy, in December. The country’s government has issued a decree requiring that workers in health care facilities be vaccinated.
Credit…Alessandro Grassani for The New York Times

ROME — Giulio Macciò tested negative for the coronavirus and spent weeks receiving treatment for emphysema in a sealed-off hospital under the care of doctors and lung specialists — and a nurse who had refused to be vaccinated. On March 11, he unexpectedly died. A post-mortem swab found that he had contracted the virus, as had 14 other patients and the unvaccinated nurse who spent her shifts in his midst.

“It makes no sense that a person whose job is to heal the sick gives them Covid and kills them,” said Mr. Macciò’s son, Massimiliano Macciò, who filed a complaint against the San Martino hospital in the northern Italian city of Genoa where his father was treated. He believes that the nurse, one of an estimated 400 who have refused vaccination against Covid-19 at the hospital, infected his father, who died unvaccinated at 79.

As vaccination rollouts build momentum, businesses everywhere are grappling with whether they can require the inoculation of their employees, raising thorny ethical, constitutional and privacy issues around Europe and the United States. But that quandary becomes all the more urgent when the person is a health care worker.

In Italy, the original Western front in the war against Covid, a rash of outbreaks in hospitals where medical workers have chosen not to be inoculated has raised fears that their stance is endangering public health. It has also prompted a forceful response from an Italian government that is struggling to get vaccinations on track.

On Wednesday, Prime Minister Mario Draghi tested the legal limits of his government’s ability to address the problem by issuing a decree requiring that workers in health care facilities be vaccinated. It also allowed hospital employers to suspend without pay any health care workers who refuse to do so.

Some legal analysts have said that requiring Covid-19 inoculation for health workers could violate Italy’s privacy laws, and that firing or forcing any who decline it to take unpaid leave could be unconstitutional because of a specific article that protects people who refuse health treatments.

An Emergent BioSolutions lab in Baltimore.
Credit…Michael Robinson Chavez/The Washington Post, via Getty Images

Workers at a plant in Baltimore manufacturing two coronavirus vaccines accidentally conflated the ingredients several weeks ago, contaminating up to 15 million doses of Johnson & Johnson’s vaccine and forcing regulators to delay authorization of the plant’s production lines.

The plant is run by Emergent BioSolutions, a manufacturing partner to both Johnson & Johnson and AstraZeneca, the British-Swedish company whose vaccine has yet to be authorized for use in the United States. Federal officials attributed the mistake to human error.

The mix-up has delayed future shipments of Johnson & Johnson doses in the United States while the Food and Drug Administration investigates what occurred. Johnson & Johnson has moved to strengthen its control over Emergent BioSolutions’ work to avoid additional quality lapses.

The mistake is a major embarrassment both for Johnson & Johnson, whose one-dose vaccine has been credited with speeding up the national immunization program, and for Emergent, its subcontractor, which has faced fierce criticism for its heavy lobbying for federal contracts, especially for the government’s emergency health stockpile.

The error does not affect any Johnson & Johnson doses that are currently being delivered and used nationwide, including the shipments that states are counting on next week. All those doses were produced in the Netherlands, where operations have been fully approved by federal regulators.

Further shipments of the Johnson & Johnson vaccine — expected to total 24 million doses in the next month — were supposed to come from the giant plant in Baltimore. Those deliveries are now in question while the quality control issues are sorted out, according to people familiar with the matter.

Federal officials still expect to have enough doses from Johnson & Johnson and the other two approved coronavirus vaccine makers to meet President Biden’s commitment to provide enough vaccine to immunize every adult by the end of May.

Pfizer is shipping its doses ahead of schedule, and Moderna is on the verge of winning approval to deliver vials of vaccine packed with up to 15 doses instead of 10, further bolstering the nation’s stock.

The problems arose in a new plant that the federal government enlisted last year to produce vaccines from Johnson & Johnson and AstraZeneca. The two vaccines use the same technology employing a harmless version of a virus — known as a vector — that is transmitted into cells to make a protein that then stimulates the immune system to produce antibodies. But Johnson and Johnson’s and AstraZeneca’s vectors are biologically different and not interchangeable.

In late February, one or more workers somehow confused the two during the production process, raising questions about training and supervision.

Vaccine production is a notoriously fickle science, and errors are often expected to occur and ruin batches. But Emergent’s mistake went undiscovered for days until Johnson & Johnson’s quality control checks uncovered it, according to people familiar with the situation. By then, up to 15 million doses had been contaminated, the people said.

None of the doses ever left the plant, and the lot has been quarantined.

Johnson & Johnson reported the mishap to federal regulators, who then started an investigation that has delayed the authorization of that plant’s production lines. The company has beefed up the number of its own staff members who monitor Emergent’s work and instituted a variety of new checks intended to protect against future lapses.

Johnson & Johnson already faced a lag in its manufacturing that has caused the company to fall behind on its commitments to the federal government, but it seemed on track to catch up. It delivered 20 million doses by the end of March, and has pledged to deliver roughly 75 million additional doses by the end of May.

White House officials hedged their projections in a phone call with governors on Tuesday, forecasting certain deliveries from Pfizer and Moderna but warning that Johnson & Johnson’s shipments would fluctuate.

In a statement late Wednesday, the company said it expected the steps it was now taking with Emergent would enable it to deliver 24 million doses by the end of April, or about what the federal government expected. But that depends on whether Johnson & Johnson satisfies Food and Drug Administration regulators.

Administering a Sinopharm shot in Budapest last month. More than 20 percent of Hungarians have received at least their first dose after the government decided to import Russian and Chinese vaccines.
Credit…Akos Stiller for The New York Times

Despite Hungary’s currently registering one of the highest per capita death tolls in the world, Prime Minister Viktor Orban has said that his government will not tighten restrictions and is determined to continue moving to reopen society.

“Infections are widespread, and lockdowns or curbs can only slow the spread but they can’t stop them,” Mr. Orban said in a televised interview on Wednesday evening.

Mass vaccination, he noted, is the only way to bring the suffering to an end.

After a month of lockdown measures to combat the virus, Mr. Orban said, the plan to reopen stores after Easter, followed by schools and then restaurants and hotels, would not change.

With more than 20 percent of Hungarians having received at least their first dose of a vaccine, the country is ahead of most other European nations. The campaign has been bolstered by Mr. Orban’s decision to import vaccines from China and Russia.

Mr. Orban has sought to keep the focus on the nation’s vaccination campaign, while downplaying the death toll and the impact on the nation’s struggling hospitals.

Hungary registers the highest fatality rate per 100,000 people in the world over the last seven days, according to the New York Times coronavirus database. There were 302 deaths reported on Wednesday, the highest since the start of the pandemic.

Concerned that the Hungarian government was obstructing access to information, more than two dozen mostly internet-based independent news outlets called on the authorities to permit reporters access to hospitals, to allow health care workers to speak with journalists on the record, and to create meaningful engagement between the news media and the government’s coronavirus task force.

The news organizations’ open letter to the government was almost immediately rebuffed by Mr. Orban.

“Now is not the time for us to go into the hospitals to produce bogus videos and fake news,” he said.

But health care experts have argued that the country’s high death rate has been made worse by the broad structural mismanagement of the government response, compounded by the burdens placed on an already understaffed health system.

“We think it’s absurd that doctors and nurses can’t speak about their experiences,” said Peter Peto, editor in chief of, an independent Hungarian news site. He added that contrary to what is allowed in other countries, the independent news media in Hungary were not permitted access to hospitals.

“Just as masks and vaccines are key weapons against the coronavirus, so too is the truth,” Mr. Peto said, “And that can only be made available to the public if the media has access to the information and people that deal with Covid.”

The display on the southern bank of the Thames in London. “We keep talking about numbers, but each heart is a person,” said Paula Smith, who has been painting the tributes.
Credit…Tolga Akmen/Agence France-Presse — Getty Images

LONDON — Paula Smith couldn’t hold back her tears as she faced a sea of hand-painted red hearts covering a wall along the River Thames, each unique, each representing someone who had died of Covid-19 in Britain.

With tears welling, Ms. Smith got back to work painting dozens more hearts on the memorial wall as passers-by stopped to watch. One heart was larger than the others, and on it she wrote in black letters: “Frank Stevens 1941-2020” — a tribute to her 78-year-old father, who died last April.

“Look at how many people we’ve lost,” said Ms. Smith, 49, as she took a step back to look at her work, sobbing behind her protective mask. “We keep talking about numbers, but each heart is a person.”

As European countries have crossed the one-year anniversary of the first coronavirus deaths and lockdown restrictions, memorials have sprung up across the continent to pay tribute to those lost to Covid-19.

The initiative that stretches along the southern bank of the Thames in London may be one of the most significant efforts to date.

Bereaved families have filled a wall 6.5 feet high with thousands of hearts that they say will eventually contain about 150,000, one for every person with Covid-19 marked on a death certificate in Britain. The country has so far recorded just over 149,000 deaths in that category so far. According to a New York Times database, the country’s toll is the largest in Europe and the fifth-highest in the world.

Maggi Gadaire fills out a Covid-19 vaccination card at The Sanford Medical Center in Fargo, N.D., in December.
Credit…Tim Gruber for The New York Times

As vaccinations become more widely available for people in the United States and travel starts picking up, many people have started sharing their simple white vaccination cards on social media as prized new possessions.

With some destinations, cruise lines and venues already requiring travelers to provide proof of vaccination against Covid-19, keeping that record is key. Last week, New York became the first state to introduce a digital tool to allow people to easily show that they have either tested negative or been inoculated against the virus in order to gain entry into some events and venues. But until such measures are taken more widely across the country, you’ll want to hang onto that little white card.

Here’s everything you need to know about your vaccine record, why it’s important and how to keep it safe.

What’s on your vaccine card?

The vaccine card, given after your first shot and then updated if your vaccine requires a second one, includes the vaccine manufacturer, the dose numbers and the date and location each was administered, according to Alex Brown, a spokeswoman for Walgreens, which is administering vaccinations at more than 5,000 stores nationwide.

What happens if I lose my card?

Getting a new card is easy enough if you got vaccinated at a pharmacy like Walgreens. Ms. Brown said that anyone who loses their card should return to where they were vaccinated and a pharmacy employee can print out a new card from the patient’s electronic records.

Vaccinations are also tracked by state health departments, so you can reach out to your state’s agency to get a replacement card, according to the Centers for Disease Control and Prevention.

Do I need my card to travel?

Some destinations and cruise lines have started requiring that travelers be fully vaccinated before they travel. As of March 26, fully vaccinated Americans who can present proof of vaccination can visit Iceland, for example, and avoid border measures such as testing and quarantining, the country’s government said.

The cruise line Royal Caribbean is requiring passengers and crew members 18 or older to be vaccinated in order to board its ships, as are Virgin Voyages, Crystal Cruises and others. For the moment, airlines are not requiring vaccinations for travel.

Will the Biden administration require a vaccine passport?

Among the Biden administration’s executive orders aimed at curbing the pandemic is one that asked government agencies to “assess the feasibility” of producing digital versions of vaccination documents. The administration has said that it would not be passing a federal mandate or distributing its own vaccine passport.

In a White House Covid-19 news conference on Monday, Andy Slavitt, the acting director for the Centers for Medicare and Medicaid Services, said that “unlike other parts of the world, the government here is not viewing its role as the place to create a passport, nor a place to hold the data of citizens.”

Lining up at a vaccination center in Hong Kong last week. Only 6 percent of the city’s 7.5 million people have received a first dose so far.
Credit…Tyrone Siu/Reuters

Hong Kong health officials said on Thursday that they would resume use of the Pfizer-BioNTech coronavirus shots next week amid a continuing investigation by the German manufacturer into packaging defects that were discovered in two batches.

The manufacturer, BioNTech, said it had found no evidence that the defects had compromised the vaccine’s safety. Until the inquiry is completed, however, Hong Kong officials said that they would administer doses from a shipment handled by a different packaging plant in Germany, where defects have not been found after repeated tests.

Constance Chan, Hong Kong’s director of health, said at a news conference that Pfizer-BioNTech vaccinations would resume on Monday, nearly two weeks after the Chinese territory suspended use because of loose lids and leakages that were found in some vials.

The suspension dealt another blow to the inoculation drive in Hong Kong, where only 6 percent of the city’s 7.5 million people have received a first vaccine dose.

About 183,000 residents who had signed up to receive the Pfizer-BioNTech vaccine had their appointments abruptly canceled. Bookings for the other vaccine that Hong Kong is using, manufactured by the Chinese company Sinovac, have fallen in recent weeks after reports that people had died after receiving it. Officials have found no direct link between the shots and the deaths.

Ms. Chan stressed that BioNTech had found no signs that the vaccines administered to residents before the suspension were unsafe. The manufacturer told Hong Kong officials that the freezing temperatures at which the vials of vaccines are stored made bacterial contamination extremely unlikely and added that its inspections had not turned up any other problems.

The company’s analysis showed that the low storage temperatures had decreased the flexibility of the vials’ plastic stoppers, potentially causing looseness around the metal rings at the openings of some of the vials. The resulting increase in air pressure inside the vials could cause spillage. But when the vials are unthawed before use, the plastic stopper regains its flexibility and the vial becomes airtight again, Ms. Chan said.

It was not clear whether such packaging issues could emerge in other places where the vaccine is in use. BioNTech has said that the flaws were limited to two batches that were shipped to Hong Kong and Macau, another Chinese territory, and handled by a Chinese distributor, Fosun Pharma.

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