![](https://scx1.b-cdn.net/csz/news/tmb/2021/israeli-study-shows-pf.jpg)
Israeli study shows Pfizer booster gives seniors big rise in immunity
(HealthDay)—A third dose of the Pfizer coronavirus vaccine gives four times greater protection against COVID-19 infection and is five to six times more effective in preventing serious illness and hospitalization in seniors ...
Aug 23, 2021
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