Coronavirus Updates The latest developments in the COVID-19 pandemic.
The novel coronavirus, first detected at the end of 2019, has caused a global pandemic.

Coronavirus Updates

Latest developments in the COVID-19 pandemic

Passengers look out from the Spectrum of the Seas cruise ship docked in Hong Kong on Wednesday. Thousands of passengers were being held on the ship for coronavirus testing after health authorities said nine passengers were linked to a recent omicron cluster and ordered the ship to turn back. Vincent Yu/AP hide caption

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Passengers look out from the Spectrum of the Seas cruise ship docked in Hong Kong on Wednesday. Thousands of passengers were being held on the ship for coronavirus testing after health authorities said nine passengers were linked to a recent omicron cluster and ordered the ship to turn back.

Vincent Yu/AP

HONG KONG — Hong Kong authorities announced a two-week ban on flights from the United States and seven other countries and held 2,500 passengers on a cruise ship for coronavirus testing Wednesday as the city attempted to stem an emerging omicron outbreak.

The two-week ban on passenger flights from Australia, Canada, France, India, Pakistan, the Philippines, Britain and the United States will take effect Sunday and continue until Jan. 21.

Hong Kong leader Carrie Lam also announced that restaurant dining will be forbidden after 6 p.m. for two weeks starting Friday. Game arcades, bars and beauty salons must also close during that period.

"We have to contain the pandemic to ensure that there will not be a major outbreak in the community again," Lam said at a news conference, adding that the city is "on the verge" of another surge.

The measures came as new omicron clusters have emerged over the past week, many linked to several Cathay Pacific crew members who broke isolation rules and dined at restaurants and bars in the city before testing positive.

Hong Kong has reported 114 omicron variant cases as of Tuesday, with most being imported. On Tuesday, it reported its first untraceable case in nearly three months, which authorities said was likely caused by the omicron variant.

Hong Kong officials have moved swiftly to block the spread of the variant, locking down residential buildings where people have tested positive and mass-testing thousands of people.

That includes about 2,500 passengers who were being held Wednesday on a cruise ship in Hong Kong for coronavirus tests, after health authorities said nine passengers were linked to an omicron cluster and ordered the ship to turn back.

Authorities forced the Royal Caribbean's Spectrum of the Seas ship, which departed Sunday on a "cruise to nowhere," to return a day early on Wednesday, according to a government statement.

The ship returned to Hong Kong on Wednesday morning and passengers were held onboard for most of the day while they awaited testing.

One passenger, Claudy Wong, said Royal Caribbean had tried its best to follow pandemic regulations.

"The pandemic has gone on for so long, actually passengers like us who board the cruise are already prepared for such situations to happen," Wong said.

Royal Caribbean said in a statement that the nine guests were immediately isolated and all tested negative, and that the company was working closely with authorities to comply with epidemic prevention policies and regulations.

It said guests who were on the affected ship would receive a 25% refund on their cruise fare. The ship's next sailing on Thursday was also canceled because the crew must undergo testing, and those guests will receive a full refund.

The city has reported a total of 12,690 confirmed coronavirus infections as of Tuesday, including 213 deaths.

Things seem grim now. But America's COVID situation could get better in 6-8 weeks

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People wait in line to receive a COVID-19 test on Tuesday in New York. The U.S. recorded more than 1 million COVID-19 cases on Monday. Angela Weiss/AFP via Getty Images hide caption

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People wait in line to receive a COVID-19 test on Tuesday in New York. The U.S. recorded more than 1 million COVID-19 cases on Monday.

Angela Weiss/AFP via Getty Images

Things might seem pretty grim on the pandemic front right now. The U.S. is only a few days into the third calendar year of the pandemic and nearly 500,000 new COVID-19 cases are being counted daily.

The country hit another record high on Monday with 1,082,549 infections. So if it's hard to find a glimmer of hope, you're not alone. But Dr. Bob Wachter has a bit of hope to share.

Wachter chairs the Department of Medicine at the University of California, San Francisco, and took to Twitter last week to share his thoughts and predictions on how the country "could be in good shape, maybe even great shape in six to eight weeks."

He joined NPR's All Things Considered to talk about the current case rates and hospitalization rates and how they might trend, the new antiviral COVID-19 pills and what the omicron variant will likely mean for the unvaccinated population.

This interview has been edited for length and clarity.


Interview highlights

Could the U.S. really be in "good shape" in terms of the pandemic in six to eight weeks?

Yeah, I think that's the likeliest outcome. I should always caveat it by the fact that over the past two years, every time things have started looking good, something bad happens. So it's possible that will happen again. There'll be another variant that will be a curveball. But if that doesn't happen, I think the likeliest outcome for February and March is that we'll be in pretty good shape.

This virus being so transmissible but now, as we understand it, being milder than the prior variants could turn out to be very good news after a very awful January.

What are you seeing in terms of case rates and hospitalization rates, and what might you hope to see there in the coming weeks?

What's happening now is the cases are exploding, as we've never seen before, and that really is a manifestation of how extraordinarily infectious omicron is. What we're not seeing is the same relationship between cases and hospitalizations. So the average case of omicron has about a 60% lower chance of landing you in the hospital than the average case of delta.

Now you might hear that and say that doesn't make sense. Why are the hospitals filling up? And the reason is, even if the average case is less likely to land you in the hospital, if there are twice or three or five times as many cases, then you will have more people laying in the hospital. So the short-term risk — and we're seeing it all over the country — is the hospitals will get filled with patients with omicron.

A fair number of doctors and nurses will be out sick with omicron. And so we have a pretty miserable month, even though the average patient has a lower chance of ending up in the hospital than he or she would have had if they had a case of delta, particularly if they're vaccinated.

But very importantly, for the people that chose not to be vaccinated — I think a very terrible choice, but who made that choice — there's a pretty good chance they're going to get a case of omicron, which will give them some immunity. And it's those two things combined — the fact that the average case is going to be milder, and more and more people are going to be immune to this virus — that gets us out of this pickle, I think, in February.

Antiviral COVID-19 pills are being rolled out. They're in small quantities so far, but what effect could these have in the coming weeks?

Yeah, it's an important new part of our armamentarium. Up till now, we've really just had monoclonal antibodies to give to people at very high risk who got COVID but were not sick enough yet to be in the hospital. But two new pills have come out. The Pfizer is a much bigger deal than the Merck. The Merck lowers the probability that someone who gets a case of omicron will land in the hospital by 30%, the Pfizer by 90%.

So, it's in short supply. The supply is growing. Within a month or two, there will be a decent supply. So that is another very important tool that we'll have.

You're the chair of medicine at a big hospital there in San Francisco. Can your high-risk patients get these COVID pills?

[They're] just starting to be available. We have them in some of our pharmacies, but we're having to triage them quite severely and be very selective about who gets them, but I think they'll become more and more available over time. It's a pretty tricky chemical compound to produce. So it is taking the company some time to produce them, but the supply should grow steadily over the next couple of months.

How are things looking for the unvaccinated? Where do you see their risks going in the next weeks and months?

If you are unvaccinated and you're not being super careful, by which I mean wearing an N95 mask all the time if you're going indoors, it's almost hard to believe that you will not get this virus.

The problem is, people who are unvaccinated are hearing that the average case of omicron is milder. It is milder, but it's particularly milder for people that are vaccinated. For the people that are unvaccinated, the best estimates from the science so far are that maybe it's about 25% less likely to land you in the hospital, and you might say, "That's OK, good, it's milder." But if it's 25% less likely to land you in the hospital and you have a five times greater chance of becoming infected in the next month, that math doesn't land you in a good place.

That means that there are going to be more and more unvaccinated people who get omicron. A lot of them will end up in hospitals. A lot of them unfortunately will end up in ICUs, and a fair number of them will be the ones who die over the next four to six weeks as this hurricane sort of rampages through our country.

People are also hearing that the vaccines and boosters aren't worth it. They don't work because everybody we know is getting sick anyway. What do you say about this?

Yeah, I can understand how people would feel that, but that's just not right. The vaccines and boosters are miraculous, and they are miraculous because what they do is markedly lower the probability that you will get very sick, go to the hospital, go to the ICU, end up on a ventilator and die.

There's no question that there are more breakthrough cases. This virus is very good at sidestepping some of your immunity, but the kind of case that you're going to have if you've had particularly three shots is so much more likely to be a mild case of a couple of days of cold or flu symptoms than it would be for the unvaccinated person. Those are the ones who are landing in the hospital, landing in the ICU, and ultimately, the deaths that we will have from omicron will be almost entirely in unvaccinated people.

Is there anything that could throw this prediction of hope off?

Sure. Two big questions going forward in terms of how rosy the future might be. One is, how good is the immunity that a case of omicron gives you against another case of either omicron or another variant? I'm sure it'll be fine for a while. But does it last for three months or a year? That will make a difference in terms of whether the risk goes up, let's say, next winter.

And the second, of course, is this great unknown, which is, will there be another variant? And anybody who tells you they can predict that is making it up because nobody I know predicted delta. Nobody I know predicted omicron. And all that means is there could be something even nastier than omicron on the horizon. And that will change the projections. But for now, I think things look pretty good.

Seth Meyers and host Jimmy Fallon appear on Late Night With Jimmy Fallon on Jan. 28, 2014, in New York City. Jamie McCarthy/Getty Images hide caption

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Seth Meyers and host Jimmy Fallon appear on Late Night With Jimmy Fallon on Jan. 28, 2014, in New York City.

Jamie McCarthy/Getty Images

As the omicron variant of the coronavirus continues to spread across the U.S., both of NBC's late-night talk show hosts, Seth Meyers and Jimmy Fallon, have announced they've tested positive for COVID-19.

"The bad news is, I tested positive for COVID (thanks, 2022!)," Meyers said in a tweet Monday. "The good news is, I feel fine (thanks vaccines and booster!)."

Meyers said the network had canceled the remainder of shows scheduled from Tuesday to Friday.

"Tune in next Monday to see what cool location we will try and pass off as a studio!!!" Meyers added.

News of Meyers' positive case comes a day after Tonight Show host Jimmy Fallon announced he had tested positive for the coronavirus right before Christmas.

In his latest Instagram post, Fallon, who appears to have recovered, says he had received a COVID-19 vaccine and booster shot — and experienced only mild symptoms.

"Thank you to the doctors and nurses who work so hard around the clock to get everyone vaxxed," Fallon wrote. "Thank you to NBC for taking the testing protocols so seriously and doing a great job - and also thanks for putting me in the 'What 'chu talkin' about Willis?' isolation room when they told me the news."

Other celebrities who've recently tested positive for the coronavirus include Whoopi Goldberg, Hugh Jackman, Debra Messing and LL Cool J.

The U.S. reported a record 1,082,549 new COVID-19 cases on Monday, according to data from Johns Hopkins University that probably includes numbers from the holiday weekend. The seven-day daily average for infections is currently 480,273.

A woman receives a booster shot at a pop-up vaccination clinic in Las Vegas on Dec. 21. Ethan Miller/Getty Images hide caption

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A woman receives a booster shot at a pop-up vaccination clinic in Las Vegas on Dec. 21.

Ethan Miller/Getty Images

People who were initially immunized with two shots of the Pfizer-BioNTech COVID-19 vaccine should receive a booster shot after five months, rather than six, according to a new recommendation from the the Centers for Disease Control and Prevention.

The move comes after the Food and Drug Administration on Monday authorized the change in the Pfizer booster interval, saying that a third shot after five months may "provide better protection sooner for individuals against the highly transmissible omicron variant."

In a statement, CDC Director Rochelle Walensky said urged eligible Americans to receive a booster as soon as possible.

"As we have done throughout the pandemic, we will continue to update our recommendations to ensure the best possible protection for the American people," Walensky said. "Today's recommendations ensure people are able to get a boost of protection in the face of omicron and increasing cases across the country, and ensure that the most vulnerable children can get an additional dose to optimize protection against COVID-19."

Recommendations for booster shots for those who initially received vaccines made by Moderna or Johnson & Johnson have not changed: Moderna recipients should seek their booster after six months; those who received Johnson & Johnson should get one after two months.

Although the FDA also authorized the use of Pfizer boosters for children ages 12 through 15, the CDC has not yet followed up with a formal recommendation. A committee of advisers to the CDC will meet to vote on that topic Wednesday, after which the agency is expected to act.

The move to shorten the Pfizer booster interval comes as the U.S. reported more than a million new cases of COVID-19 on Monday, an eye-popping new record that far exceeds the worst days of last winter's surge. (Hospitalizations and deaths are rising at much slower rates and have not reached the levels seen last winter.)

That case record is likely to be an undercount, experts say, given the widespread availability of at-home tests.

The CDC now estimates that more than 95% of COVID-19 infections in the U.S. are caused by the omicron variant, which appears to be much more transmissible than previous variants — including among those who are vaccinated or have been previously infected with COVID-19.

Sheep and goats stand together on Monday in Schneverdingen, Germany, as they form an approximately 330-foot syringe to promote vaccinations against COVID-19. Philipp Schulze/dpa via AP hide caption

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Philipp Schulze/dpa via AP

Sheep and goats stand together on Monday in Schneverdingen, Germany, as they form an approximately 330-foot syringe to promote vaccinations against COVID-19.

Philipp Schulze/dpa via AP

BERLIN — Tasty bits of bread did the trick for about 700 sheep and goats to join Germany's drive to encourage more people to get vaccinated against COVID-19.

The animals were arranged on Monday into the shape of a roughly 330-foot syringe in a field at Schneverdingen, south of Hamburg.

Shepherd Wiebke Schmidt-Kochan spent several days practicing with her animals, news agency dpa reported. But she said in the end, it wasn't difficult to work things out — she laid out pieces of bread in the shape of the syringe, which the sheep and goats gobbled up when they were let out into the field.

Organizer Hanspeter Etzold said the action was aimed at people who are still hesitating to get vaccinated.

Sheep and goats stand together in Schneverdingen, Germany, before they form an approximately 330-foot syringe to promote vaccinations against COVID-19. Philipp Schulze/dpa via AP hide caption

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Philipp Schulze/dpa via AP

Sheep and goats stand together in Schneverdingen, Germany, before they form an approximately 330-foot syringe to promote vaccinations against COVID-19.

Philipp Schulze/dpa via AP

"Sheep are such likeable animals — maybe they can get the message over better," he said.

The German government has made an accelerated vaccination campaign its top priority in attempting to beat back the latest wave of COVID-19 infections.

The percentage of the population that has received at least two shots stood on Monday at 71.2%. Those who have received a booster shot has increased much faster in recent weeks and now stands at 38.9% of the population.

Health Ministry spokesman Andreas Deffner said on Monday that the public debate over vaccinations in recent weeks appeared to have prompted some holdouts to change their mind.

In a more conventional contribution to the drive, Berlin nightclubs on Monday pitched in by offering vaccinations.

Lutz Leichsenring, spokesman for the Clubcommission, the association of Berlin nightclubs, said that half of the vaccination appointments have already been taken up. Sage Beach and several other clubs are offering about 4,500 shots in total this week.

Authorities in Germany have recently closed or put restrictions on clubs in order to slow omicron variant's spread. Berlin authorities banned dancing, prompting many clubs to shut their doors.

"We all hoped that if you have such a high vaccination rate as we have in the club scene, that you can then also hold safe events, and that is unfortunately not the case," Leichsenring said.

Secretary of Defense Lloyd Austin, pictured in Seoul, South Korea, in early December, has tested positive for COVID-19. Jeon Heon-kyun/Pool/Getty Images hide caption

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Secretary of Defense Lloyd Austin, pictured in Seoul, South Korea, in early December, has tested positive for COVID-19.

Jeon Heon-kyun/Pool/Getty Images

Secretary of Defense Lloyd Austin has tested positive for COVID-19.

"I tested positive this morning for COVID-19. I requested the test today after exhibiting symptoms while at home on leave," Austin said in a statement late Sunday. "My symptoms are mild, and I am following my physician's directions."

"In keeping with those directions, and in accordance with CDC guidelines, I will quarantine myself at home for the next five days," he said.

Austin, 68, said that he is fully vaccinated and was boosted in October. He said that while he quarantines, he plans to continue with key meetings and discussions virtually, "to the degree possible" and that Deputy Defense Secretary Kathleen Hicks would represent him as necessary.

He said that his staff had begun contact tracing and testing anyone who he'd been in contact with over the last week.

"My last meeting with President Biden occurred on Tuesday, December 21st, more than a week before I began to experience symptoms," Austin said. "I tested negative that very morning. I have not been in the Pentagon since Thursday, where I met briefly — and only — with a few members of my staff. We were properly masked and socially distanced throughout."

Austin is the second high-profile Biden administration Cabinet member to get COVID-19. In October, Homeland Security Secretary Alejandro Mayorkas also tested positive. At the time, Mayorkas said he was fully vaccinated and that his symptoms amounted to only "mild congestion."


This story originally appeared in the Morning Edition live blog.

Dr. Anthony Fauci said on Sunday that the CDC was considering adding testing negative to its recommendations for when people could stop isolating after testing positive. Anna Moneymaker/Getty Images hide caption

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Dr. Anthony Fauci said on Sunday that the CDC was considering adding testing negative to its recommendations for when people could stop isolating after testing positive.

Anna Moneymaker/Getty Images

The Centers for Disease Control and Prevention is considering altering its recommendations for people with COVID-19 after it got pushback on its new guidelines, Dr. Anthony Fauci said.

President Biden's chief medical adviser said there was "some concern" that the CDC told people to isolate for five days but did not recommend that they get a negative test before leaving isolation.

"That is something that is now under consideration," Fauci said Sunday during an interview on ABC's This Week.

On Monday the CDC cut the number of days it recommends COVID-positive people remain in isolation from 10 days to five if they are no longer showing symptoms. People are urged to wear masks for another five days after that to avoid infecting others.

The CDC said transmission generally occurs one or two days before symptoms begin and two to three days after. Health officials were also concerned that the high number of people testing positive with the virus and being forced to isolate — particularly essential workers — could cause major disruptions to the economy.

But the agency did not include anything in its guidance about testing negative for COVID before leaving isolation, something critics say should be included in the updated recommendations.

"Looking at it again, there may be an option in that, that testing could be a part of that," Fauci said.

"I think we're going to be hearing more about that in the next day or so from the CDC," he added.

Meanwhile, tests have been hard to come by for millions of people, with some waiting hours in long lines.

Travelers make their way through Miami International Airport on Tuesday. Airlines canceled more than 2,400 U.S. flights by midday on Saturday, according to the flight tracking website FlightAware. Joe Raedle/Getty Images hide caption

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Travelers make their way through Miami International Airport on Tuesday. Airlines canceled more than 2,400 U.S. flights by midday on Saturday, according to the flight tracking website FlightAware.

Joe Raedle/Getty Images

In just a few weeks, the U.S. will mark two years since the first confirmed case of COVID-19 in the country, and the number of new infections has never been higher.

The Centers for Disease Control and Prevention reported 486,428 confirmed coronavirus cases on Wednesday, the highest single-day total since the pandemic began, according to agency data.

The spike — driven by the delta variant and the highly infectious but potentially milder omicron strain — has snarled holiday plans for many and presented a big question mark at the start of the new year, now the country's third in the pandemic.

Travelers face a wave of flight cancellations

One area that's been walloped by the recent surge in COVID cases is airline travel, and those attempting to fly during the holidays continue to face an uphill battle to get off the tarmac.

Airlines canceled more than 2,400 U.S. flights by midday on Saturday, according to the flight tracking website FlightAware. Chicago, which is also under a winter storm warning, was experiencing hundreds of cancellations at its two main airports.

There were another 2,000 delays impacting U.S. flights.

And more disruptions to air travel could be ahead. The Federal Aviation Administration warned that an increase in the number of air-traffic control staff testing positive for COVID could lead to more flight disruptions, according to The Wall Street Journal.

"To maintain safety, traffic volume at some facilities could be reduced, which might result in delays during busy periods," an FAA spokesperson told the newspaper.

It's not only airlines that have been impacted by the recent surge. The CDC said there's also been an increase in the number of COVID-19 cases among cruise ship staff and passengers, and it's warning people to avoid cruise travel regardless of their vaccination status.

Colleges, universities switch to online classes to start the new semester

The list of universities opting to start the upcoming semester with remote instruction continues to grow, too.

Duke University, American University and Michigan State University were among those to announce this week that they were delaying the start of in-person classes to slow the spread of COVID on their campuses.

"I realize that students prefer to be in person, and so do I. But it is important that we do so in a safe manner," MSU president Samuel L. Stanley Jr. said in a statement. "Starting the semester remotely and de-densifying campus in the coming weeks can be a solution to slowing the spread of the virus."

They join other institutions of higher learning that had already announced plans for a remote start to the new school year earlier last month.

An public safety message from the government of South Africa. The country announced on Thursday that it was past the peak of its latest coronavirus surge. South African Government/Twitter hide caption

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South African Government/Twitter

An public safety message from the government of South Africa. The country announced on Thursday that it was past the peak of its latest coronavirus surge.

South African Government/Twitter

Coronavirus restrictions have been loosened in South Africa as case numbers wane in the country, though the government says that there is still reason for caution.

"All indicators suggest the country may have passed the peak of the fourth wave at a national level," the government said in a statement Thursday, adding that the risk of infection remains "given the high transmissibility of the omicron variant."

South Africa was the first country to detect the omicron variant in November, and the subsequent wave drove the country's seven-day rolling average of daily cases more than 70 times higher — from 327 on Nov. 17 to 23,437 a month later.

The government set an overnight curfew, restricted alcohol sales and capped public gatherings in an effort to slow the spread.

When the government relaxed those restrictions Thursday, ahead of New Year's Eve celebrations, the rolling average of daily cases was down more than half from the mid-December peak — to 10,324 — and still trending downward in nearly every part of the country.

Omicron caused less-severe cases in South Africa, but things could be different in other countries

One silver lining to the latest surge: South African researchers have found that those infected with omicron in the country are, on average, less likely to end up in the hospital. And, as NPR's Michaeleen Doucleff has reported, they also appear to recover more quickly from illness, compared to the other variants.

But it remains to be seen whether that will be the case in the rest of the world, as other countries begin to contend with their own omicron surges.

Experts believe that because of South Africa's past dramatic spikes and relatively low vaccination rate — less than a quarter of the population when the omicron wave began — most South Africans had probably already been exposed to the coronavirus and had some amount of immune protection.

In countries with less exposure, including the United States, it is possible that cases could be more severe.

Already, new cases in the U.S. are at an all-time high, with the daily average new cases at approximately 356,000. An analysis from the University of Washington predicts that that number will continue to rise until mid-January, when the coronavirus is expected to infect more than 400,000 Americans a day.

That is a staggering number compared to last winter's surge, when the high in the United States was 250,000 new cases each day, then an all-time record.

During that surge, more than 3,000 Americans a day were dying from the virus. In recent weeks, 1,300 Americans have died every day — a shocking number, but one that has, so far, held steady despite the rise in cases.

The Carnival Cruise Line's Carnival Sunrise ship is seen in the port of Miami on Dec. 23, 2020, amid the coronavirus pandemic. Daniel Slim/AFP via Getty Images hide caption

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Daniel Slim/AFP via Getty Images

The Carnival Cruise Line's Carnival Sunrise ship is seen in the port of Miami on Dec. 23, 2020, amid the coronavirus pandemic.

Daniel Slim/AFP via Getty Images

The Centers for Disease Control and Prevention issued a new advisory Thursday that travelers should avoid traveling by cruise ship, regardless of vaccination status, after a recent surge in positive COVID-19 cases onboard ships.

The agency increased its travel warning for cruises to Level 4 — the highest level — following investigations of dozens of ships that have had outbreaks of the virus.

"Even fully vaccinated travelers may be at risk for getting and spreading COVID-19 variants," the CDC said on its website.

Following the identification of the omicron variant, there has been an increase in the number of COVID-19 cases among cruise passengers and crew reported to the agency, the CDC said.

More cruise ships have reached "level yellow" — the level where the CDC investigates a ship's COVID outbreak.

"It is especially important that travelers who are at an increased risk of severe illness from COVID-19 avoid travel on cruise ships, including river cruises, worldwide, regardless of vaccination status," the agency added.

There are 91 cruise ships currently under investigation or observation, according to the CDC website. However, the agency has not specified how many COVID-19 cases have been reported, according to The Associated Press.

An additional three ships are being monitored.

The CDC advised that those who choose to travel on a cruise should get vaccinated against COVID-19 before their trip and, if eligible, receive a booster dose.

In addition, masks should also be worn in shared spaces and passengers who are not fully vaccinated against COVID should self-quarantine for five days after travel, in addition to getting tested three to five days after their return, the CDC said.

In an email to NPR, a spokesperson for the Cruise Lines International Association said the trade group was "disappointed" by the CDC's latest advisory against cruise ship travel.

"While we are disappointed and disagree with the decision to single out the cruise industry—an industry that continues to go above and beyond compared to other sectors—CLIA and our ocean-going cruise line members remain committed to working collaboratively with the CDC in the interest of public health and safety," the trade group said.

Most cruise lines require adult passengers to show proof of vaccination against COVID-19, according to AP.

For now, CDC guidance allows cruise ships to relax measures — such as mask usage — if at least 95% of passengers and 95% of the cruise ship crew are fully vaccinated against the coronavirus.

A medical worker administers a coronavirus test at a new testing site at the Times Square subway station in New York City on Monday. Scott Heins/Getty Images hide caption

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A medical worker administers a coronavirus test at a new testing site at the Times Square subway station in New York City on Monday.

Scott Heins/Getty Images

People who test positive for the coronavirus need to isolate themselves for only five days if they don't show symptoms, the Centers for Disease Control and Prevention said Monday. This cuts in half the earlier recommendation of 10 days of isolation.

Data shows that the majority of coronavirus transmission "occurs early in the course of illness," the CDC explained — generally in the one or two days before symptoms begin and two or three days after.

"Therefore, people who test positive should isolate for 5 days and, if asymptomatic at that time, they may leave isolation if they can continue to mask for 5 days to minimize the risk of infecting others," the CDC said in a statement.

The CDC has also updated its recommended quarantine period for people exposed to the virus. It says unvaccinated people should quarantine for five days, followed by five days of "strict mask use." Exposed people who are more than six months past their second dose of the Pfizer-BioNTech or Moderna vaccines, or two months out from a Johnson & Johnson vaccine, should also quarantine for five days.

People who have gotten their booster shot don't need to quarantine after exposure but should wear a mask for the next 10 days.

Alejandro Brown receives a COVID-19 vaccine from a health care worker at a drive-through site in Miami on Dec. 16. Joe Raedle/Getty Images hide caption

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Alejandro Brown receives a COVID-19 vaccine from a health care worker at a drive-through site in Miami on Dec. 16.

Joe Raedle/Getty Images

"The Omicron variant is spreading quickly and has the potential to impact all facets of our society," said the CDC's director, Dr. Rochelle Walensky, in a statement. "CDC's updated recommendations for isolation and quarantine balance what we know about the spread of the virus and the protection provided by vaccination and booster doses. These updates ensure people can safely continue their daily lives."

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Dr. Megan Ranney, the associate dean at Brown University's School of Public Health, tweeted Monday that a major reason the federal government altered isolation requirements is due to the economic strain of a full quarantine.

"Our economy is going to shut down if everyone has to isolate for 10 days. Luckily the science backs up the move, at least partially," she tweeted. "On the one hand: I'm all for following the science for the vaccinated & asymptomatic. No reason to keep people home unnecessarily."

Kudos, she said, to the CDC "for recognizing that our knowledge has changed - and the virus has changed" especially for the vaccinated.

Ranney said what would make this decision even safer would be to require a rapid test before ending isolation.

The CDC doesn't currently require this step and rapid, at-home COVID tests have been hard to come by during the omicron surge.

The Biden administration, which has come under pressure for not increasing widespread availability of at-home tests, last week rolled out a plan to set up federal testing across the country. The government will also buy a half-billion at-home COVID test kits and mail them out. But deliveries won't start until January.

The new guidance comes days after the CDC loosened rules for how long health care workers should isolate after infection with the coronavirus, from 10 days to seven days. If there were staffing shortages, that isolation time could be further reduced.

The next day, New York officials followed suit, reducing to five the number of days for health care workers to isolate after a positive coronavirus test. On NPR's Morning Edition on Monday, Dr. Anthony Fauci praised the move.

Five days of quarantine should be enough for health care workers, Fauci said, adding: "That's going to be under consideration of whether or not we want to diminish it" for the general public.

In the U.S. as of Monday, 242 million people have received at least one dose of a COVID-19 vaccine, 205 million are fully vaccinated and 66 million have received a booster, according to the CDC's COVID Data Tracker.

Dr. Anthony Fauci, chief medical adviser to President Biden, says easing quarantine rules for health care workers will help keep them in their essential jobs. Anna Moneymaker/Getty Images hide caption

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Anna Moneymaker/Getty Images

Dr. Anthony Fauci, chief medical adviser to President Biden, says easing quarantine rules for health care workers will help keep them in their essential jobs.

Anna Moneymaker/Getty Images

Dr. Anthony Fauci, President Biden's chief medical adviser, is praising New York officials for lowering the number of days health care workers must remain in quarantine after having COVID-19.

The state announced on Christmas Eve that fully vaccinated health care staff and other essential workers can return to work five days after a positive coronavirus test if they meet certain safety standards. Previously they had to remain out for 10 days.

"You need the health care workers. And when you have them out for the full 10 days, and you do that over a wide swath of people, you can have a situation where you really do not have enough health care workers," Fauci told NPR's Morning Edition on Monday.

"I think that's something that we're going to be considering" beyond New York, Fauci added.

Public health officials have worried that the highly infectious omicron variant, though it may cause milder illness, could once again overwhelm hospitals with the sheer number of patients getting sick.

The Centers for Disease Control and Prevention updated its guidance for health care workers with COVID-19 last week, saying they could return to work after seven days if they were asymptomatic and had a negative test.

"As the healthcare community prepares for an anticipated surge in patients due to Omicron, CDC is updating our recommendations to reflect what we know about infection and exposure in the context of vaccination and booster doses," CDC Director Dr. Rochelle Walensky said at the time.

Fauci said easing quarantine guidance for the general population would be "under consideration" but added that the administration was currently focusing on getting essential workers back on the job.

Fauci also said during an interview on MSNBC's Morning Joe that it would be "reasonable to consider" a vaccine requirement for domestic flights. He noted that such mandates already exist for some colleges and workplaces, and that it might help boost the number of Americans who get the shot.

"When you make vaccination a requirement, that's another incentive to get more people vaccinated," Fauci said. "If you want to do that with domestic flights, I think that's something that seriously should be considered."


A version of this story originally appeared in the Morning Edition live blog.

Employees of Nomi Health check in a long line of people for COVID-19 tests on Tuesday in North Miami, Fla. Marta Lavandier/AP hide caption

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Marta Lavandier/AP

Employees of Nomi Health check in a long line of people for COVID-19 tests on Tuesday in North Miami, Fla.

Marta Lavandier/AP

MIAMI — A COVID-19 outbreak took place on a South Florida-based cruise ship for the third time this week, as the number of coronavirus cases in Florida hit its highest level since the start of the pandemic.

An undisclosed number of passengers and crew aboard the Carnival Freedom cruise caught the virus so the ship was denied entry to Bonaire and Aruba, Carnival said in a statement.

The ship has 2,497 passengers and 1,112 crew members and was scheduled to return to Miami on Sunday following an 8-day cruise. Passengers were required to be vaccinated and they were tested before leaving last Saturday, according to Carnival.

"Carnival Freedom is following all protocols and has a small number on board who are in isolation due to a positive COVID test," the statement said. "Our protocols anticipate this possibility and we implement them as necessary to protect the health and safety of our guests and crew."

Ashley Peterson, a passenger on the ship, tweeted a photo of a Dec. 22 letter from the ship's captain apologizing for being unable to make stops in Aruba and Bonaire. The letter said passengers would get $100 per room in onboard credit, as well refunds for planned excursions.

It was the third outbreak this week affecting cruise ships operated by Carnival and Royal Caribbean departing Miami and Fort Lauderdale.

Meanwhile, Florida had 31,758 new COVID-19 cases on Friday, breaking a record for the most cases in a single day since the start of the pandemic in the U.S. in March 2020, according to data from the U.S. Centers for Disease Control and Prevention.

The new record was driven by the spread of the new omicron variant through the Sunshine State.

The previous single-day highest number of cases was in last August, during the height of the delta variant wave in Florida, when 27,802 cases were reported.

A man looks at the departures board at Salt Lake City International Airport on Friday. Thousands of flights have been canceled over the Christmas weekend in the U.S. alone, with airlines citing bad weather and the pandemic. Rick Bowmer/AP hide caption

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Rick Bowmer/AP

A man looks at the departures board at Salt Lake City International Airport on Friday. Thousands of flights have been canceled over the Christmas weekend in the U.S. alone, with airlines citing bad weather and the pandemic.

Rick Bowmer/AP

The holiday season travel stress has only escalated amid the rise of the omicron variant. Several airlines are reporting staff shortages from the spread of the coronavirus, leaving passengers with delayed or canceled flights.

According to the flight tracker Flight Aware, 997 flights within, into or out of the United States were canceled on Christmas. Another 888 flights have been canceled so far on Sunday. They're among the more than 5,000 flights canceled worldwide this weekend.

Hundreds of the delayed and canceled flights are coming from China Eastern and Air China, but U.S.-based airlines such as Delta, United and JetBlue are also seeing high cancellation numbers.

"Winter weather in portions of the U.S. and the omicron variant continued to impact Delta's holiday weekend flight schedule Saturday, Christmas Day. The airline canceled 344 mainline and connection flights of the day's schedule that included approximately 3,000 scheduled flights after exhausting all options and resources to prevent those cancelations," Delta Airlines told NPR in a statement on Saturday afternoon.

Delta had expected more than 200 of its flights will be canceled on Sunday; as of early afternoon Eastern time, 161 had been canceled, the airline said. Delta says it canceled 375 flights on Saturday and 212 on on Friday.

American Airlines, which canceled at least 88 flights on Saturday, told NPR in a statement that their operations have been "running smoothly" but that COVID-related sick calls led them to pre-cancel some of their scheduled flights for the day. Affected customers were notified Friday, they said.

While airline travel was starting to pick back up before the omicron variant emerged, the massive spike in positive COVID-19 cases in recent weeks has become a cause for concern to airlines in keeping airline staff and passengers safe.

Lawmakers, including Sen. Dianne Feinstein (D-Calif.), are calling on the Centers for Disease Control and Prevention and the Federal Aviation Administration to make a major change and require proof of vaccination or a negative COVID test in order to travel on all domestic flights.

"Ensuring the health and safety of air travelers and their destination communities is critical to mitigating the ongoing COVID-19 surge, especially as the virus continues to evolve," the lawmakers wrote in a letter to the CDC and FAA on Monday.

"Requiring proof of vaccination or a negative test for domestic flights would improve public health and address concerns that passengers have about flying," the letter said.

Vaccination protocols for international travelers coming into the U.S. are already in place, according to the CDC.

New York Gov. Kathy Hochul shortened the quarantine period for many essential workers even as infections have surged because of the omicron variant. Mary Altaffer/AP hide caption

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Mary Altaffer/AP

New York Gov. Kathy Hochul shortened the quarantine period for many essential workers even as infections have surged because of the omicron variant.

Mary Altaffer/AP

New York Gov. Kathy Hochul says most of the state's essential workers can return to work just five days after a positive coronavirus test if they're fully vaccinated and meet other safety standards.

Previously, workers were required to stay away from their jobs for at least 10 days.

Hochul said Friday the change in quarantine guidelines will make it easier to maintain "critical services that New Yorkers need, healthcare, transportation, grocery stores."

The policy shift will affect employees in a wide range of industries, from pharmacies and food processing plants to hospitals and taxi fleets.

The governor made the announcement as infections have surged nationwide because of the omicron variant.

In New York state, officials said the number of daily infections rose dramatically in recent days, up from roughly 22,000 on Tuesday to more than 44,000 on Thursday.

During a briefing Christmas Eve, Hochul also pointed to data suggesting the latest COVID strain may cause less severe infections.

"Positive cases don't mean you're too sick [to work] and require hospitalization," she said. "We want to make sure our critical workforce ... can get back."

In a statement, New York's acting Health Commissioner Dr. Mary Bassett said the impact of the winter omicron surge on the workforce "is already being felt."

"A reduction of isolation from 10 days to 5 days is sensible guidance and in alignment with the recent CDC guidance for health workers," Bassett said.

On Thursday, the Centers for Disease Control and Prevention issued new national guidance allowing workers with COVID-19 to return to work after 7 days of quarantine, with a new negative test.

"[T]hat isolation time can be cut further if there are staffing shortages," the CDC said in a statement.

Officials in New York chose to cut the quarantine period even further — setting the state guideline at 5 days rather than 7. They also said workers returning to the job do not need to be retested.

Employees do, however, have to be fully vaccinated and wear a mask on the job site. They also have to be asymptomatic or "mildly symptomatic," with no fever for 72 hours.

During her briefing, Hochul said rising hospitalization rates are also putting additional strain on health care workers. She voiced sorrow for those who've lost loved ones to the pandemic during the holiday season.

"Our hearts go out to their family members just on the verge of this beautiful holiday," Hochul said. "To know there's going to be an empty seat at the table has to be incredibly painful."

Some Christmas travelers face canceled flights as the omicron surge hits airlines

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A Lufthansa flight arrives at Miami International Airport last month. The German airline, along with United and Delta, reported canceling dozens of Christmas Eve departures as illnesses tied to the omicron variant of COVID-19 take a toll on flight crew. Lynne Sladky/AP hide caption

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Lynne Sladky/AP

A Lufthansa flight arrives at Miami International Airport last month. The German airline, along with United and Delta, reported canceling dozens of Christmas Eve departures as illnesses tied to the omicron variant of COVID-19 take a toll on flight crew.

Lynne Sladky/AP

As if this second holiday season of the pandemic wasn't hard enough, many looking forward to seeing family and friends for Christmas were informed at the last minute that their flights had been canceled. A main reason is that the highly contagious omicron variant of coronavirus has left airlines short-staffed.

"The nationwide spike in Omicron cases this week has had a direct impact on our flight crews and the people who run our operation," said United Airlines in a statement to NPR.

The airline said it had canceled more than 175 flights for Friday and 69 on Saturday, and was notifying customers before they arrived at the airport. "We're sorry for the disruption and are working hard to rebook as many people as possible and get them on their way for the holidays."

Likewise, Delta Air Lines canceled around 145 flights for Friday. It said some were due to potential bad weather, but also noted the impact of the omicron variant on its crews.

"Delta teams have exhausted all options and resources — including rerouting and substitutions of aircraft and crews to cover scheduled flying," Delta said in a statement to NPR. "We apologize to our customers for the delay in their holiday travel plans."

Delta said it was also working to rebook travelers.

Brianne Armstrong of San Antonio says she hit "crisis mode" when she saw a cancellation text from United Airlines at 2:30 am, just as she was getting ready for her 6:15 am flight to the Dominican Republic.

She tells NPR that after postponing a trip to Amsterdam in the fall and then canceling it altogether last week due to coronavirus, she pivoted to the Dominican Republic — mostly because it had few COVID-19 restrictions. Now Armstrong is rebooked on a Christmas Day flight and is hoping that won't get canceled, too.

Armstrong wonders if, after nearly two years of pandemic, a shift is needed so every new variant doesn't pose another crisis. "How do we live with this, how do we plan for the future of this?" she says. "Are we being proactive, or are we being reactive to every time there's a new variant?"

According to Flightaware, nearly 3,400 flights were canceled worldwide on Friday and Saturday. While more than half of the cancellations came from Chinese airlines, about 20% were from U.S.-based carriers.

Germany-based Lufthansa also canceled a dozen transatlantic flights citing a "massive rise" in sick leave, though the airline said it couldn't confirm whether that was related to COVID-19.

On Thursday, Airlines for America (A4A), a lobby group for airlines, wrote CDC director Rochelle Walensky asking for changes that could ease staffing shortages. The letter says current guidelines call for 10 days of isolation for flight crew. But A4A wants that to be shortened to 5 days from the onset of symptoms for those who experience a breakthrough infection.

"Current medical data suggests that Omicron is 25% to 50% more contagious, but likely less virulent and milder symptoms particularly among people who are fully vaccinated," the lobby group wrote, noting that the latest variant seems to have a shorter incubation period and infectious period for vaccinated individuals.

On Thursday the U.S. shortened COVID-19 isolation rules for health care workers only.

The holiday cancellations are just the latest challenge for an airline industry only beginning to recover from the Thanksgiving holiday — its busiest week since the pandemic began. To accommodate the surge in Christmas travelers, some airlines had offered employees incentive pay to work extra hours or not call in sick.

Despite the ongoing omicron-fueled COVID-19 surge, the Transportation Security Administration said it expected to screen some 30 million passengers from Dec. 20 through Jan. 3. That compares to nearly 44 million during the same period prior to the pandemic.

People wait at a street-side testing booth in New York's Times Square on Monday. Ed Jones/AFP via Getty Images hide caption

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People wait at a street-side testing booth in New York's Times Square on Monday.

Ed Jones/AFP via Getty Images

The omicron variant is now considered the most dominant version of the coronavirus — making up 73% of new COVID-19 infections last week in the U.S., according to new data released by the Centers for Disease Control and Prevention on Monday.

The new estimates capture cases for the week that ended on Dec. 18.

The new estimates underscore just how rapidly it has spread across the U.S. As of a week prior, Dec. 11, it was detected in only 12.6% of positive COVID-19 cases that were sampled.

The CDC said it was working on revising some of the earlier numbers after officials finish analyzing more samples of the strain.

Omicron is even more prevalent in some parts of the U.S., including the Pacific Northwest, the Great Lakes, the Southeast, a cluster of states centered on Texas, and New England, where it is above 90% of samples.

Since the end of June, the delta variant of COVID-19 had been the primary strain of the virus causing the majority of U.S. infections, with more than 99% of new coronavirus cases being delta in the past several months.

Much about the omicron variant, scientists say, still remains uncertain — including whether the new variant causes more- or less-severe illness.

"All of us have a date with omicron," Dr. Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security, told The Associated Press. "If you're going to interact with society, if you're going to have any type of life, omicron will be something you encounter, and the best way you can encounter this is to be fully vaccinated."

Omicron has already triggered a wave of new infections across the U.S. and the world, with health officials warning of its extraordinary transmissibility. Early data suggests that while omicron can more easily evade immune protection and booster shots than prior strains, those infected may be less likely to experience severe disease and hospitalization.

However, "even if it has a somewhat lower risk of severity, we could be having a million cases a day if we're not really attentive to all of those mitigation strategies," outgoing National Institutes of Health Director Francis Collins told NPR over the weekend.

Getting booster shots appears to still offer substantial protection against severe disease and death from omicron, according to health officials.

Fans do the wave during a preseason game between the Seattle Seahawks and the Las Vegas Raiders at Allegiant Stadium on Aug. 14 in Las Vegas. Ethan Miller/Getty Images hide caption

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Fans do the wave during a preseason game between the Seattle Seahawks and the Las Vegas Raiders at Allegiant Stadium on Aug. 14 in Las Vegas.

Ethan Miller/Getty Images

The world of professional sports is back in disarray with the entry of the omicron variant.

Players have been benched after testing positive, games have been canceled or postponed and leagues and players' unions are scrambling to figure out how to move forward under a cloud of uncertainty.

The NHL has postponed 27 games so far and will postpone another 12 through Thursday because of COVID. The NBA postponed five games because of the number of players and staff who had entered the league's COVID-19 protocols. NFL game delays were also piling up.

The NHL and the National Hockey League Players' Association announced Sunday that the regular season would continue, but cross-border games between the U.S. and Canada would be rescheduled.

Just one day earlier, the NHL said it was stepping up coronavirus safety measures in the face of omicron through at least Jan. 7, including increased testing requirements for both vaccinated and unvaccinated players.

The NFL appeared to take a different tack. Starting on Sunday, the league said it would only test unvaccinated and symptomatic players, The Associated Press reported. Vaccinated players would no longer be tested weekly.

"It's not about loosening our standards," said Dr. Allen Sills, the league's chief medical officer, according to the AP. "If anything, we're just bringing a higher degree of precision in measuring ourselves against a more precise ruler."

Sills encouraged players to report symptoms to the league, get booster shots and limit their exposure to the virus, according to NFL Network reporter Mike Garafolo.

Scientists believe the omicron variant spreads faster than any previous variant, and it is also better at causing breakthrough infections in vaccinated people. What's unclear is whether it's more or less severe than previous strains, such as delta.

Professional sports leagues haven't required players to be vaccinated, but a vast majority of players have gotten the shot. The leagues also have rigorous testing regimes in place, and experts say that means it's possible the high number of infections they're recording now is a harbinger of what's to come for the population at large.

"I do worry that it's possible — maybe not likely, but possible — that these sports leagues' numbers are a bit of a canary in the coal mine for the rest of us," Zach Binney, a sports epidemiologist at Oxford College of Emory University, told NPR on Wednesday.

It's unclear how long this phase of increased caution will last. But the NHL and the players' union, citing disruptions to the schedule and the pandemic, also said they were "actively discussing" player participation in the 2022 Winter Olympics, set to begin in Beijing, China, in February.

NIH Director Dr. Francis Collins holds up a model of the coronavirus as he testifies before the Senate in May. Collins is retiring as director of the NIH. Sarah Silbiger/AP hide caption

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Sarah Silbiger/AP

NIH Director Dr. Francis Collins holds up a model of the coronavirus as he testifies before the Senate in May. Collins is retiring as director of the NIH.

Sarah Silbiger/AP

On his last day as director of the National Institutes of Health, Dr. Francis Collins' frustration was evident.

"I get upset because people point to anecdotes of somebody who got sick even though they had been vaccinated and say, 'There, you see, it doesn't work,' " Collins told Fox News Sunday guest host Bret Baier. "That's way too simplistic."

As the omicron variant of COVID-19 is set to wend its way through the American population — wreaking particular havoc on the unvaccinated — 50 million vaccine-eligible Americans still haven't gotten even one dose of COVID-19 vaccine. "How did that happen?" Collins asked. "How did we get all of this so mixed up with social media, misinformation, and political insertion into the discussion? This is the thing for me on my last day as NIH director that I find particularly frustrating."

Collins' last day comes as the virus is ravaging the unvaccinated — who often tend to be Fox News viewers. An NPR investigation this month found that vaccination rates are far lower in counties that strongly supported Donald Trump during the last presidential election. People in counties that went 60% or higher for Trump have been almost three times as likely to die from COVID-19. Studies have found that Fox News viewers are more likely to believe COVID-19 misinformation.

"We've got to remember, this is the enemy," Collins said, holding up a model of the virus. "It's not the other people in the other political party. It's not the people on Facebook who are posting all sorts of crazy conspiracies. This is the enemy. We in this country have somehow gotten all fractured into a hyper-polarized, politicized view that never should have been mixed with public health. It's been ruinous and history will judge harshly those people who have continued to defocus the effort and focus on conspiracies and things that are demonstrably false."

On CBS' Face the Nation Sunday, Collins warned that with its dozens of mutations, the omicron variant "has the properties to potentially be evasive of the vaccines." Collins urged the 60% of Americans who are eligible for a booster shot but haven't gotten one to take action.

One monoclonal antibody treatment is still effective against omicron

Collins also noted that only one available monoclonal antibody treatment — made by GlaxoSmithKline and Vir Biotechnology — seems to be effective against the omicron variant. Regeneron's cocktail — known as REGEN-COV — has "diminished potency" against omicron, the company acknowledged last week.

GSK-Vir's treatment "still sticks to the spike protein that omicron has," Collins said — key to protecting people against the virus. There is a push to produce more of that treatment, Collins said, adding that health officials will have to save that treatment for people who are at higher risk.

Collins also acknowledged the news from Pfizer that two doses of its vaccine are likely not enough to protect children under 5. That delays plans to introduce vaccinations for kids aged 2-4, as Pfizer now studies the effectiveness of a three-dose regimen. "Really we ought to think about surrounding them with vaccinated people to keep them from getting infected," Collins said.

Fauci warns of omicron's transmissibility

Omicron is particularly concerning because of its "extraordinary" transmissibility, Dr. Anthony Fauci said on ABC News' This Week. Omicron has a "doubling time" of just 2-3 days, he said. That's the time it takes for the number of coronavirus cases to double — and it's faster than delta, the current dominant strain in the U.S.

Based on data out of South Africa, where omicron has already been running through the population, it appears that the omicron variant leads to less severe symptoms and requires less hospitalization. But that might be due to other factors, Fauci said, like "the fact that their population has so much experience with prior infections that it might be underlying immunity that's making it look like it's less severe."

And even if omicron does turn out to be less severe than delta, the sheer number of expected omicron infections is likely to overcome the "slight-to-moderate diminution in severity," Fauci said, warning that U.S. hospitals "are going to be very stressed with people."

Secretary of Defense Lloyd Austin speaks during a media briefing at the Pentagon last month. The military branches have begun discharging people who refuse to get vaccinated against COVID-19. Alex Brandon/AP hide caption

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Alex Brandon/AP

Secretary of Defense Lloyd Austin speaks during a media briefing at the Pentagon last month. The military branches have begun discharging people who refuse to get vaccinated against COVID-19.

Alex Brandon/AP

Members of the U.S. military who haven't been vaccinated against COVID-19 are starting to face the consequences. Military officials announced this week that, after months of warnings, they have begun disciplinary actions — including discharge.

The Air Force was the first of the branches to announce dismissals, saying Tuesday it had discharged 27 people who refused to get the vaccine. On Thursday, the Marines said it had discharged 103 troops. The Army has reprimanded 2,700 soldiers and said it will begin discharge proceedings in the new year. And the Navy this week told commanders to start "administrative separations" for "vaccine refusers."

But the vast majority of the armed services have followed orders. In the Navy, 98.4% of its force fully vaccinated, according to the Associated Press. The Air Force says 97.5% have received at least one shot. Army officials said that 98% of active-duty forces have received at least one dose of the vaccine, while 96% — nearly half a million people — are fully vaccinated. About 95% of Marine Corps forces have gotten at least one shot.

That still leaves potentially thousands of active-duty soldiers who might be forced out in the coming weeks or months. Although that would slightly reduce the size of the military, the Pentagon says it's important to keep that in perspective.

In the Army's case, for instance, less than 1% of the force has refused the vaccine. Secretary of Defense Lloyd Austin is most concerned with "the readiness of the force and the importance of the vaccine," Pentagon press secretary John Kirby told reporters. Getting the vaccine, he said, is "the best way to protect themselves and their units.

The Pentagon began requiring members of the military to get vaccinated in late summer. There are "active discussions" within the Pentagon about requiring booster shots as well, Kirby said. The booster shot provides strong protection against the omicron variant of the coronavirus, medical officials have said.

Thousands of troops across the services have asked for exemptions from the vaccine requirement, some of which have been granted. Medical exemptions are often available when, for instance, someone is allergic to a vaccine ingredient, or has an underlying health condition that could cause adverse reactions.

At least 12,000 service members have asked for religious exemptions, none of which have yet been granted. Religious exemptions are "always rare," Kirby told reporters earlier this month.

"This has absolutely nothing to do with trampling on the religious liberties of our men and women in uniform," he said. "It's about a military medical requirement to keep them safe, to keep their family safe, to keep their units safe."

The Pentagon has also required all National Guard members to get vaccinated against the coronavirus, but some states have pushed back. Republican governors from five states wrote to the defense secretary this week arguing that the Pentagon didn't have the authority to discharge Guard members for refusing the vaccine.

A child, with parent in tow, arrives to receive the Pfizer COVID-19 vaccine for children 5 to 11 years old at London Middle School in Wheeling, Ill., last month. Nam Y. Huh/AP hide caption

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Nam Y. Huh/AP

A child, with parent in tow, arrives to receive the Pfizer COVID-19 vaccine for children 5 to 11 years old at London Middle School in Wheeling, Ill., last month.

Nam Y. Huh/AP

Pfizer-BioNTech announced Friday that they will expand ongoing clinical trials of their COVID-19 vaccine in children to include a third dose for participants as young as 6 months old.

Testing a third dose will cause a delay in submission of data to regulators to authorize use in the U.S. In the fall, Pfizer's CEO said the company expected to have data for this age group by the end of 2021. Now, the company says that they would expect to file results in the "first half of 2022" if trials are successful.

The companies said two doses did not produce a robust immune response in kids 2 to 5 years old.

The companies, which produced the first vaccine against coronavirus infection authorized for use in the U.S., said they had made the decision "following a routine review by the external independent Data Monitoring Committee," which acts as a watchdog over the clinical trials.

"The study will now include evaluating a third dose of 3 [micrograms] at least two months after the second dose of the two-dose series to provide high levels of protection in this young age group," the companies said in a statement.

"No safety concerns were identified and the 3 [microgram] dose demonstrated a favorable safety profile in children 6 months to under 5 years of age," they said.

So far, the Food and Drug Administration has only authorized the Pfizer-BioNTech vaccine for emergency use in children aged 5 and older.

Research has indicated that the Pfizer-BioNTech vaccine is less effective against rapidly spreading omicron variant than for previous strains of the virus. However, a booster dose has been shown to add significant protection. Earlier this week, Moderna announced similar results for its vaccine.

Last month, the FDA authorized a third booster dose of either vaccine for all U.S. adults.

"The data are illustrating the impact of a booster and that our vaccine works best as a primary regimen of three doses," Pfizer's chief scientific officer, Mikael Dolsten, said on a conference call, according to Reuters.

Pfizer also said it was developing a vaccine tailored to combat the omicron variant of the virus — which has spread rapidly around the globe in recent weeks. The company hopes to start clinical trials on the updated omicron-specific vaccine in January.

Pfizer also said 30 million of a planned 80 million treatment courses of its Paxlovid antiviral pill will be available in the first six months of 2022.

Doses of the Johnson & Johnson COVID-19 vaccine are stacked in boxes at the McKesson facility in Shepherdsville, Ky., on March 1. Pool/Getty Images hide caption

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Pool/Getty Images

Doses of the Johnson & Johnson COVID-19 vaccine are stacked in boxes at the McKesson facility in Shepherdsville, Ky., on March 1.

Pool/Getty Images

The Centers for Disease Control and Prevention accepted advice from a panel of experts to recommend the use of the Moderna and Pfizer-BioNTech COVID-19 vaccines over the Johnson & Johnson jab, following growing concerns about rare blood clots.

The advisers said Thursday that vaccines from Pfizer and Moderna should be preferred by all adults, who may be at greater risk for developing severe blood clots from the J&J; vaccine than those under age 18. Some committee members said the J&J; vaccine should remain available for people who prefer it.

The recommendation was prompted by the occurrence of a rare and sometimes fatal blood-clotting problem called thrombosis with thrombocytopenia syndrome (TTS). Earlier reports of the issue addressed cases of cerebral venous sinus thrombosis (CVST), a type of TTS.

In a statement, Johnson & Johnson said it "remains confident in the overall positive benefit-risk profile" of its vaccine.

"The safety and well-being of those who use the Johnson & Johnson vaccine continues to be our number one priority," said Dr. Mathai Mammen, head of drug research and development at Johnson & Johnson, in the statement. "We appreciate today's discussion and look forward to working with the CDC on next steps."

The blood clots are extremely rare, the CDC says

The CDC said the problem is rare, but it has been seen at a rate of about one case in every 100,000 doses given to women 30 to 49 years old — the group at highest risk. About 15% of cases of TTS have been fatal, according to CDC data.

The symptoms of TTS vary, but they can include headache, blurred vision, fainting or loss of consciousness, loss of control over movement in part of the body and seizures.

In April, the CDC and the Food and Drug Administration recommended a temporary pause in use of the vaccine after six cases of the rare blood clots were seen in the United States. Later that month, the agencies rescinded the pause after an analysis of available data showed that the benefits of the vaccine outweigh its risks. Since then, more data has been gathered confirming the initial reports of blood clots.

A key advantage of the J&J; jab was already eroded

The J&J; vaccine was authorized by the FDA as a one-dose vaccine, compared with the two doses for the vaccines from Moderna and Pfizer. But the advantage of a one-dose vaccine for some people has been eroded by a CDC recommendation in September that people who got the J&J; vaccine receive a booster two months later.

More than 16 million people in the U.S. have been immunized with a shot of the J&J; vaccine. More than 870,000 have received a J&J; booster.

The novel coronavirus, first detected at the end of 2019, has caused a global pandemic.

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