tomaseyasu25 tomaseyasu25

06-05-2020
Biology

contestada

if memory cells are always present after the first exposure to a virus, then why do people get the flu every year?

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Аноним Аноним

06-05-2020

Answer:

People get the flu every year because unfortunately the flu virus mutates every year.

Explanation:

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nessaxrae nessaxrae

07-05-2020

The flu virus mutates ever year and develops a new strain. This is why we all must get the flu vaccine every season because it keeps changing to the genetic makeup of the ever changing virus.

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