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The flu vaccine is not a new vaccine that is developed from scratch every year. The flu virus mutates rapidly into different strains, meaning that a vaccination from a previous year will not protect you for another year's strain. The vaccine is modified to take account of this - it is not developed from scratch every time.

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13y ago
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11y ago
  • It may not have been handled correctly, flu vaccine requires refrigeration.
  • Flu vaccine is only designed to work on three strains of the virus, you might have caught a different strain.
  • They actually gave you old vaccine left over from an earlier year.
  • etc.

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Q: Why does the flu vaccine developed each year not always work?
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