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Why do doctors recommend that people get a new flu shot every year?.
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19 votes
Why do doctors recommend that people get a new flu shot every year?.

User Ali Jafargholi
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2 Answers

9 votes
Because the flu virus changes every year
User Knomo Seikei
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10 votes

Answer:

Because last year's flu shot might not be effective as the new one

User Vishal Tavande
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