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5 votes
Why does a new flu shot need to be made each year ?

2 Answers

12 votes
the flu virus constantly mutates itself to try and make itself immune so it could keep attacking. the human body’s immune system also slowly declines over time.

i hope this helps you!
User AbhinayMe
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5 votes

because we could be sick if don't get the shot there is a higher chance to have the flu

User Steverino
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