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US OKs Covid booster to counter waning vaccine efficacy

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Washington (AFP) – The US government said Wednesday it will make Covid-19 booster shots available to all American adults beginning next month, as it warned that vaccines are showing a declining effectiveness against infection. The move comes as scientists and health experts grapple with how to beat back the surging Delta variant of the coronavirus, and follows extensive debate over whether a third injection of the Pfizer-BioNTech and Moderna vaccines would be appropriate. “Recent data makes clear that protection against mild and moderate disease has decreased over time… likely due to waning …

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