Multiple factors account for vaccine effectiveness. One is the vaccine itself, 2nd is biological factors like age - the older you are, the more vulnerable you are to the disease & 3rd factor is waning of immunity:WHO chief scientist Soumya Swaminathan(29.12)
(PC source: Reuters) pic.twitter.com/JR45ErpLZY— ANI (@ANI) December 29, 2021
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