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 U.S. Centers...
source https://www.ndtv.com/world-news/vaccine-effectiveness-dropped-after-delta-became-dominant-us-health-body-2517998
source https://www.ndtv.com/world-news/vaccine-effectiveness-dropped-after-delta-became-dominant-us-health-body-2517998
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