Antibodies produced by the #Pfizer (@pfizer) vaccine against #Covid19 decreased more than 80 per cent after six months in some elderly people, according to a study that emphasises the need for booster shots.
Read: https://t.co/oOTdsdAo6P pic.twitter.com/eyqy3nNFLn— IANS Tweets (@ians_india) September 3, 2021
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