SAN FRANCISCO -- The recent outbreak of the omicron variant has many people running for the store for an over-the-counter rapid test. But simply taking the test once isn't enough to tell you if you ...

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The question quickly arose whether existing rapid antigen tests could detect newly emerging variants. Using clinical samples obtained from diagnostic labs throughout the U.S. from 2020 to 2023, the ...

As we get into another winter holiday season, COVID is still part of our lives. And although it's hard to predict exactly what this year's cold, flu and coronavirus season will look like, experts want ...

Add Yahoo as a preferred source to see more of our stories on Google. "Knowing how long you will test positive for COVID-19 is crucial for patients as it provides clarity on the duration of their ...

When someone close to you tests positive for COVID-19, it’s natural to feel an immediate sense of urgency. The question that often follows is simple but critical: how long should you wait before ...

It seems easy enough to take a COVID-19 test at home. But what if your results aren't so simple to interpret? If you get just a faint line, does that mean you're actually positive for COVID? I know ...

The U.S. government is mailing out another round of free COVID tests to households that sign up. Older COVID tests still may be in your cupboard and OK to use, but you must verify the test’s ...