Pfizer booster may lower COVID-19 risk 11-fold, early research suggests

Adults who received a booster dose of Pfizer's COVID-19 vaccine are 11 times less likely to be infected after 12 days, according to a preprint study released Aug. 27 by Israeli researchers.

The real world study included more than 1 million people ages 60 or older who received a third dose of Pfizer's COVID-19 at least five months after their second dose. The study took place in Israel, which approved COVID-19 boosters this summer.