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14 June, 20:49

Flu shots are vaccines against the most common strains of the flu virus. most vaccines are rarely changed but new flu vaccines are produced every year. why are flu shots constantly being reformulated? the flu virus is not completely known.

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  1. 14 June, 23:38
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    As most people don't take flu shots because later one you develop the flu plus there are symptoms of the shot so yes the flu is not fully known so that's why it's being changed constantly.
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