Flu viruses can change year on year. Consequently, vaccines are made each year to provide protection against the flu viruses that are predicted to circulate, and therefore the vaccine needs to be given on an annual basis.

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How effective is the flu vaccine?

The flu vaccine will help prevent you getting flu and is your best protection against the virus. It will not stop all flu viruses but if you do get flu after vaccination, it’s likely to be milder and shorter-lived than it would otherwise have been. It takes between 10 and 14 days for your immune system to respond fully after you’ve had the flu jab.