Joe Palca

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MARY LOUISE KELLY, HOST:

The worrisome omicron variant of the coronavirus has been turning up all over the world. It has not been found in the United States yet. But as the president's chief medical adviser, Anthony Fauci, told NPR today...

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AUDIE CORNISH, HOST:

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SCOTT SIMON, HOST:

Pfizer and BioNTech have asked the Food and Drug Administration to authorize their COVID-19 booster shot to all people 18 and older.

The companies say the request is based on results from a study of more than 10,000 volunteers that show vaccine efficacy of 95% or greater for people receiving the booster.

Conventional wisdom says that if you're vaccinated and you get a breakthrough infection with the coronavirus, you can transmit that infection to someone else and make that person sick.

But new evidence suggests that even though that may happen on occasion, breakthrough infections might not represent the threat to others that scientists originally thought.

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