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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asked Jul 28, 2021 130k views

2 Answers

Whatever · Answer 1 · 2021-07-30T07:26:03+0000

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.

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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