Total antibody levels produced by both #Pfizer (@pfizer) & #AstraZeneca (@AstraZeneca) appear to start declining from as early as 6 weeks after two vaccine doses and can reduce by more than 50 per cent over 10 weeks, according to a new study stressing the need for booster doses. pic.twitter.com/pJfZIkx803— IANS Tweets (@ians_india) July 27, 2021
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