Studies show the vaccine remains highly protective against severe COVID-19, but results from Israel released last month suggest its effect wanes. Its effectiveness against symptomatic infection peaked at 96% two months after study participants got their second dose. By six months, it was down to about 84%. Israel, which exclusively administered the Pfizer shot, has been offering a booster to people over 50 to control its delta surge. Researchers are still trying to understand to what extent the breakthrough infections are due to waning immunity or vulnerability to the delta variant.
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