Covid-19: Vaccine efficacy diminished as Delta arose, CDC report shows
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.
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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. 
