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U.S. health officials on Monday cut isolation restrictions for asymptomatic Americans who catch the coronavirus from 10 to five days, and similarly shortened the time that close contacts need to quarantine.

Centers for Disease Control and Prevention officials said the guidance is in keeping with growing evidence that people with the coronavirus are most infectious in the two days before and three days after symptoms develop.

The decision also was driven by a recent surge in COVID-19 cases, propelled by the omicron variant.

Read the new recommendations

Over shortened COVID isolation guidelines

Early research suggests omicron may cause milder illnesses than earlier versions of the coronavirus. But the sheer number of people becoming infected — and therefore having to isolate or quarantine — threatens to crush the ability of hospitals, airlines and other businesses to stay open, experts say.

CDC Director Rochelle Walensky said the country is about to see a lot of omicron cases.

"Not all of those cases are going to be severe. In fact many are going to be asymptomatic,” she told The Associated Press on Monday. “We want to make sure there is a mechanism by which we can safely continue to keep society functioning while following the science."

Last week, the agency loosened rules that previously called on health care workers to stay out of work for 10 days if they test positive. The new recommendations said workers could go back to work after seven days if they test negative and don’t have symptoms. And the agency said isolation time could be cut to five days, or even fewer, if there are severe staffing shortages.

Now, the CDC is changing the isolation and quarantine guidance for the general public to be even less stringent.

The change is aimed at people who are not experiencing symptoms. People with symptoms during isolation, or who develop symptoms during quarantine, are encouraged to stay home.

The CDC’s isolation and quarantine guidance has confused the public, and the new recommendations are “happening at a time when more people are testing positive for the first time and looking for guidance,” said Lindsay Wiley, an American University public health law expert.

Nevertheless, the guidance continues to be complex.

The isolation rules are for people who are infected. They are the same for people who are unvaccinated, partly vaccinated, fully vaccinated or boosted.

The quarantine rules are for people who were in close contact with an infected person but not infected themselves.

For quarantine, the clock starts the day someone is alerted they may have been exposed to the virus.

Previously, the CDC said people who were not fully vaccinated and who came in close contact with an infected person should stay home for at least 10 days.

Now the agency is saying only people who got booster shots can skip quarantine if they wear masks in all settings for at least 10 days.

That’s a change. Previously, people who were fully vaccinated — which the CDC has defined as having two doses of the Pfizer or Moderna vaccines, or one dose of the Johnson & Johnson vaccine — could be exempt from quarantine.

Now, people who got their initial shots but not boosters are in the same situation as those who are partly vaccinated or are not vaccinated at all: They can stop quarantine after five days if they wear masks in all settings for five days afterward.

Suspending both isolation and quarantine after five days is not without risk.

A lot of people get tested when they first feel symptoms, but many Americans get tested for others reasons, like to see if they can visit family or for work. That means a positive test result may not reveal exactly when a person was infected or give a clear picture of when they are most contagious, experts say.

Dr. Beth Thielen, an infectious disease expert with M Health Fairview, says that transmission usually happens right before symptoms start and right after. 

"Early on the guidance was set very stringently to capture really any infection,” Thielen said. “So we can move that window into a narrower space, if we accept the risk, that we may miss some transmissions that happen out of that window."

So, we're not going to prevent as many transmissions with this new strategy, but we will still capture a lot.

When people get infected, the risk of spread drops substantially after five days, but it does not disappear for everyone, said Dr. Aaron Glatt, a New York physician who is a spokesperson for the Infectious Diseases Society of America.

“If you decrease it to five days, you're still going to have a small but significant number of people who are contagious,” he said.

That's why wearing masks is a critical part of the CDC guidance, Walensky said.

How will people know if they are asymptomatic?

That's really a key question and Thielen agrees there's some grey area here.

First, what may feel asymptomatic to you might not to someone else — there's no way to measure this. Most people don't test for COVID-19 routinely, only if they have symptoms, right, so Thielen said that asymptomatic cases are likely undercounted for that reason.

If you work in a setting where mask-wearing or routine testing is required, this may not be much of an issue. But for many people, it's quite likely they won't be following these protocols because they have no reason to think they have the virus.

The new CDC guidance is not a mandate; it’s a recommendation to employers and state and local officials. Last week, New York state said it would expand on the CDC’s guidance for health care workers to include employees who have other critical jobs that are facing a severe staffing shortage.

It’s possible other states will seek to shorten their isolation and quarantine policies, and CDC is trying to get out ahead of the shift. “It would be helpful to have uniform CDC guidance” that others could draw from, rather than a mishmash of policies, Walensky said.

Given the timing with surging case counts, the update “is going to be perceived as coming in response to pressure from business interests,” Wiley said. But some experts have been calling for the change for months, because shorter isolation and quarantine periods appeared to be sufficient to slow the spread, she said.

The move by CDC follows a decision last week by U.K. officials to reduce the self-isolation period for vaccinated people who test positive for COVID-19.

For some industries, the new guidance could be a big help — health care and long-term care, for example, which are already strapped for workers and could be undercut even more with widespread staff shortages due to the omicron variant.

Patti Cullen, president and CEO of Care Providers of Minnesota, a group that represents long-term-care facilities, says that some of her facilities may stick with the longer quarantine period because this new guidance does come with some risk, and the long-term-care industry has been really hit hard by COVID-19.

"During the flu season and cold season, we might not see as big of a sea changes as what's anticipated in health care personnel because they're going to be overly cautious," Cullen said.

At the same time, Scott Croonquist, executive director of the Association of Metropolitan School Districts, says having staff out due to the virus has been a massive issue for schools this year. He said that schools are still waiting on details about the new CDC recommendations, but that they “should help with these staffing shortages and help keep students in school."

Right now, state officials say they are working through the details of the new federal guidance and should have news soon on how it will be implemented locally.

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Catharine Richert

U.S. health officials are cutting isolation restrictions for Americans who test positive for the coronavirus and shortening the time that close contacts have to quarantine.

U.S. health officials are cutting isolation restrictions for Americans who test positive for the coronavirus and shortening the time that close contacts have to quarantine. The change is intended to help alleviate staff shortages in health care, schools and, as we've seen with widespread flight cancellations over the holidays, the airline industry. MPR News reporter Catharine Richert has been looking into what these new rules will look like in Minnesota.

U.S. officials recommend shorter COVID isolation, quarantine

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