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...
from NDTV News - World-news https://ift.tt/2Wn71Se
from NDTV News - World-news https://ift.tt/2Wn71Se
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August 24, 2021
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