Vaccination

US booster shots start, even as millions remain unprotected

The U.S. launched a campaign to offer boosters of Pfizer's COVID-19 vaccine to millions of Americans on Friday even as federal health officials stressed the real problem remains getting first shots to the unvaccinated.

Diseases, Conditions, Syndromes

Pfizer says third shot of vaccine boosts COVID protection

New data show that protection from both doses of the Pfizer COVID-19 vaccine decreases slightly over time, but that a third dose significantly boosts levels of antibodies against several variants of the virus, including the ...

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