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What happens to the influenza virus every 20-40 years, and why? What are the recent example(s)?

Answer :

conniechen2700

Answer:

The influenza virus is mutated every 20-40 years.

Explanation:

Large mutations occur every 20-40 years. This results in a new influenza virus to  which the human population has no protection. These large mutations are almost always followed by an influenza pandemic.

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