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Eddi Din [679]
3 years ago
13

Why do vaccine makers have to guess which flu strains will be active months before the flu season begins?

English
2 answers:
just olya [345]3 years ago
7 0

Vaccines take a long time to make the answer for apex

kobusy [5.1K]3 years ago
5 0
I don’t know for sure , and I don’t think this is the correct answer but I think the answer is because vaccines take a long time
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