LOS ANGELES -- The COVID-19 vaccines made by Pfizer and Moderna both require two doses to be administered, several weeks apart, for them to be fully effective. But there has been some scientific ...

Despite a U.S. factory mixup, more Johnson & Johnson doses are becoming available in the U.S., marking the only single-shot vaccine option. So how effective is it and how does it compare to the Pfizer ...

Pfizer Inc.’s covid-19 vaccine remained highly effective after six months, according to new long-term results that the company said could be used to seek an expansion of its regulatory status.

(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 https ...

The Pfizer/BioNTech vaccine is 93% effective in preventing hospitalization due to Covid-19 among children ages 12 to 18, according to a study by the US Centers for Disease Control and Prevention.

In a new document posted ahead of a key meeting of the US Food and Drug Administration's vaccine advisers, Pfizer says its vaccine is safe and 90.7% effective against symptomatic Covid-19 in children ...

LOS ANGELES - Following the recent emergency approval by U.S. regulators for a coronavirus vaccine from Johnson & Johnson which contains a single-dose regimen, some medical experts are saying one dose ...