paris723 paris723

04-09-2019
Chemistry

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Why is each year's vaccine different?

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Ytrynadewarrior Ytrynadewarrior

04-09-2019

Because the birds that fly overseas carry different flu viruses every year.

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320username 320username

04-09-2019

Answer:

Flu vaccinations are needed each year to ensure you have continuous protection. Though you may have received a flu vaccine last year, your body's immune system from previous vaccinations gradually decreases over time. By the time flu season comes around, your body's immunity to it is virtuality non-existent.

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