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How do flu jabs provide protection?

The flu jab, like all vaccines, works by stimulating our immune system to produce antibodies to fight the disease. They do this without actually giving us the disease.1

To develop a flu jab, manufacturers use the flu virus and then weaken it so it cannot cause flu. The much weakened version of the virus is then mixed with other ingredients such as stabilisers and preservatives, to make a vaccine dose.1

When you receive a dose of flu jab, the much weakened virus present in the vaccine is not able to cause flu, but it is enough to stimulate your immune system so it produces antibodies to the flu virus. When some weeks or months later you come into contact with someone who has flu, your immune system recognises the virus straight away and produces antibodies to fight the infection.1

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