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21 December, 04:13

Why is each year's vaccine different?

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Answers (2)
  1. 21 December, 05:27
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    Because the birds that fly overseas carry different flu viruses every year.
  2. 21 December, 07:18
    0
    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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