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

User Joon W K
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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.
User Whatever
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Answer:

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

Step-by-step explanation:

User Gaurav Aggarwal
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