Question

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How do scientists know how to make a flu vaccine if viruses can be different every year?

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Answer 1

Answer:

Explanation: hey dear here is your answer

Scientists gather information about virus mutations or changes before the flu season begins this lets them to predict what each year flu virus might look like ❤️❤️❤️

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Answer 2

Answer:

How do scientists know how to make a flu vaccine if viruses can be different every year?

The flu virus changes every year. However, scientists gather information about virus mutations, or changes, before the flu-virus season begins. This lets them predict what each year’s flu virus might look like. Based on that, a vaccine is made that we hope will be accurate enough to help people fight off major cases of the flu.