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Alchen [17]
3 years ago
15

Why do we have to get the flu shot every year ?

Biology
1 answer:
SOVA2 [1]3 years ago
4 0

Answer:

Because flu viruses evolve so quickly, last year's vaccine may not protect you from this year's viruses. New flu vaccines are released every year to keep up with rapidly adapting flu viruses.

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