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Pfizer says immunity drops to 83% within six months in people who got its COVID-19 shot, further bolstering the company case for a booster

The effectiveness of Pfizer’s COVID-19 shot can drop to 83% within four to six months after getting the second dose of its vaccine. This is the latest indication that vaccine-induced immunity to the virus can wane and some kind of boost may be necessary in the future.
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