U.S. move to shorten COVID-19 isolation stirs confusion, doubt

The decision by U.S. health officials to shorten the recommended COVID-19 isolation and quarantine period from 10 days to five is drawing criticism from some medical experts and could create confusion among many Americans.

To the dismay of some authorities, the new guidelines allow people to leave isolation without getting tested to see if they are still infectious.

The guidance has raised questions about how it was crafted and why it was changed now, in the middle of another wintertime spike in cases, this one driven largely by the highly contagious Omicron variant.

Monday's action by the U.S. Centers for Disease Control and Prevention (CDC) cut in half the recommended isolation time for Americans who are infected with the coronavirus but have no symptoms. The CDC similarly shortened the amount of time people who have come into close contact with an infected person need to quarantine.

The new guidance was issued amid warnings from the business community that the spike in cases could soon cause widespread staffing shortages because of workers being forced to stay home. Already, thousands of airline flights have been cancelled over the past few days in a mess blamed on Omicron.

CDC officials said the guidance is in keeping with growing evidence that people with the virus are most infectious in the first few days.

But other experts questioned why the guidelines let people leave isolation without testing.

"It's frankly reckless to proceed like this," said Dr. Eric Topol, founder and director of the Scripps Research Translational Institute. "Using a rapid test or some type of test to validate that the person isn't infectious is vital."

He added: "There's no evidence, no data to support this."

WATCH | CDC announces it will shorten the recommended COVID-19 isolation period:

Just last week, the CDC loosened rules that previously called on health-care workers to stay off the job for 10 days if they test positive. The new recommendations said workers could go back after seven days if they test negative and don't have symptoms.

Early research suggests Omicron may cause milder illnesses than earlier versions. 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.

"Not all of those cases are going to be severe. In fact, many are going to be asymptomatic," CDC director Dr. Rochelle Walensky said Monday. "We want to make sure there is a mechanism by which we can safely continue to keep society functioning while following the science."

Louis Mansky, director of the Institute for Molecular Virology at the University of Minnesota, said there is a scientific basis to the CDC's recommendations.