NEWS

Covid-19 vaccine Efficacy came down as Delta variant arose

august 25, 2021

The effectiveness of Covid-19 vaccines among front-line workers declined to 66% after the delta variant became dominant, compared with 91% before it arose, according to a report from the US Centers for Disease Control and Prevention.The vaccines are still protective, the CDC said, and the finding must be interpreted with caution, as vaccine effectiveness might wane over time and the estimates of efficacy were imprecise.

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