One dose of Ad5-nCoV (Convidecia), a #COVID19 vaccine developed in #China, is 57.5% effective against symptomatic Covid-19 and 91.7% effective against severe Covid-19 disease beginning 28 days post-vaccination, finds a new study. pic.twitter.com/uezqJxauJ2— IANS Tweets (@ians_india) December 25, 2021
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