Pfizer says Covid booster shot 95.6% effective

A booster shot of the anti-Covid-19 vaccine developed by Pfizer/BioNTech is 95.6 percent effective against symptomatic infection, according to trial data published by the makers on Thursday. The clinical phase three trial with “10,000 participants 16 years of age and older” showed “a relative vaccine efficacy of 95.6 percent against disease during a period when […]

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