The Food and Drug Administration said Tuesday that preliminary research shows some rapid antigen tests may be less sensitive at detecting the highly contagious omicron variant of the coronavirus.
The FDA, along with researchers from the National Institutes of Health, used samples from patients confirmed to be infected with the omicron variant to study how well antigen tests work. The agency said early results suggest that antigen tests “do detect the omicron variant but may have reduced sensitivity,” meaning it's possible the tests could miss an infection, known as a "false negative.
“With with every new variant, we have to make sure that the tests work, and it looks like the tests work for this. But they're not picking up infections as early as previous versions,” she said. “So if you feel any symptoms but test negative, it's not a get-out-of-jail-free card. You may need to test again and hold off a little bit on assuming that you're negative.”
but have no symptoms should isolate for five days, down from the previous recommendation of 10 days. It attributed the change to growing evidence that the virus is most infectious in the two or three days after symptoms arise.
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