apnews.com/article/covid-science-health-0edbe09ddb0c4a2dc84d10689002e372
FDA: Take 3 home tests if exposed to COVID to boost accuracy of tests. Previously, the Food and Drug Administration had advised taking two rapid antigen tests. Agency says new studies suggest that protocol can miss too many infections. New guidance applies to people without symptoms who think they may have been exposed.

The new tests are less sensitive than laboratory tests but have become the standard testing approach. Instead of detecting the coronavirus itself, they detect protein traces, known as antigens. The Centers for Disease Control and Prevention recommends people without symptoms wait five days after an exposure. The tests can give false negatives if taken too early.

All 22 home antigen tests on the U.S. market were authorized for emergency use. The FDA said its latest decision reflects new information on the accuracy of antigen tests. It generally takes several days before the antigens reach levels detectable via testing with a nose swab.
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