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Optimal time to get the flu vaccine ahead of winter

What causes the winter flu and how does it differ from other types of flu and colds? | Decomplicated

The flu season has started early this year and is expected to be severe, prompting a focus on vaccination.
In the UK, free flu vaccines are prioritised for high-risk groups, including those over 65, individuals with weakened immune systems, and health and social care workers; others can pay for a flu vaccine at some pharmacies, with October or November usually the optimum time.
The flu vaccine typically takes about two weeks to reach peak effectiveness as the immune system needs time to produce protective antibodies.
It is safe to receive both the COVID and flu vaccines at the same time, with any potential side effects usually being mild and lasting less than 24 hours.
Scientists globally predict circulating flu strains annually to develop trivalent vaccines, and even if the match isn't perfect, the vaccine still offers protection against severe disease and transmission.