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Sati [7]
3 years ago
12

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.
Health
1 answer:
patriot [66]3 years ago
7 0
The answer is b. viruses mutate from year to year
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