How does it work? of Flu jab

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Your body starts making antibodies to the vaccine virus about a week to ten days after the injection, and they help protect you against any similar viruses you then come into contact with.

Flu vaccinations protect against most flu viruses: they wonâ€™t stop you catching the many other viruses that appear every winter. Because flu is generally more serious, it makes sense to get protected.

The flu virus changes , so you need to have a flu jab every year to make sure that you are protected against the latest strain of the virus.

There is no active virus in a flu vaccine so it cant cause flu. People sometimes catch other flu-like viruses, or very occasionally catch flu before the vaccine takes effect.