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wolverine [178]
3 years ago
11

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

English
2 answers:
choli [55]3 years ago
4 0
Because it will help prevent the sickness from forming or worsening into a more deadly form 
kompoz [17]3 years ago
4 0

Answer: The bird flu like other flu is caused by a virus and this virus mutates very fast with time. Mutation is a change in the genetic make up of an organism which in this case, makes them resistant to vaccines that was effective on them not too long ago.

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