The first dose of the Pfizer vaccination is 85 percent effective against coronavirus infection between two and four weeks after inoculation, according to a study published in the Lancet medical ...

(Reuters) - The first dose of Pfizer Inc and BioNTech's COVID-19 vaccine is 85% effective, a study of Israeli healthcare workers published in The Lancet here medical journal has found. The research ...

Pfizer said Wednesday that a booster dose of its COVID-19 vaccine may offer important protection against the new omicron variant even though the initial two doses appear significantly less effective.

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