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Lilliana Griffin
Chemistry
17 July, 14:09
Why is each year's vaccine different?
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Juliet Boyle
17 July, 14:11
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Because the birds that fly overseas carry different flu viruses every year.
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Chris Nielsen
17 July, 14:13
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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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