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A booster shot of Pfizer’s COVID-19 vaccine has been found to be 95.6% effective, according to The Wall Street Journal (subscription).

The study: “Researchers found 109 cases of symptomatic COVID-19 among study subjects who received a placebo shot, compared with five cases in people who took the vaccine, resulting in 95.6% efficacy, the companies said. The additional dose was safe and tolerable, and consistent with what was known about the vaccine, the companies said.”

Defeating delta: Unlike some prior studies, this examination was carried out during a time when the delta variant of COVID-19 was widespread, suggesting that the booster is a good defense against the newer and more transmissible strain.  

Why it’s new: Previous studies have shown that boosters of COVID-19 vaccines increase antibody levels—a proxy for protection against COVID-19—but this study is the first to demonstrate that a booster provides actual protection to individuals who receive it.

Get your shot: Check out the NAM’s resource page for vaccine information at This Is Our Shot to learn more about the benefits of vaccinations and find useful guidance on how to get your community vaccinated.