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 vaccine may decrease to 83% within four to six months of receiving the second dose of the vaccine. This is the latest suggestion that vaccine-induced immunity to the virus may be weakening and some kind of reinforcement may be needed in the future.

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