paris723
paris723 paris723
  • 04-09-2019
  • Chemistry
contestada

Why is each year's vaccine different?

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Ytrynadewarrior
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.

Explanation:

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