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why do doctors suggest that people get a flu vaccine each year?a. viruses replicate more rapidly over time.b. viruses can mutate from year to year.c. vaccines are absorbed by the body after a year.d. vaccines
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why do doctors suggest that people get a flu vaccine each year?a. viruses replicate more rapidly over time.b. viruses can mutate from year to year.c. vaccines are absorbed by the body after a year.d. vaccines get stronger over time.

User Shiney
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The answer is b. viruses mutate from year to year
User Entara
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