Why Do We Need A New Flu Shot Every Year?

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3495   4 years ago
samer176 | 6 subscribers
3495   4 years ago
New flu vaccines are released every year to keep up with rapidly adapting flu viruses. Because flu viruses evolve so quickly, last year's vaccine may not protect you from this year's viruses. After vaccination, your immune system produces antibodies that will protect you from the vaccine viruses.
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