What should you know about flu shot this year?

Influenza viruses change over time, and the viruses circulating in one season may differ from those in another. Vaccine composition and local recommendations are therefore reviewed for the season. Protection develops after vaccination rather than immediately, and it can lessen over time. The vaccine is intended to reduce the chance of influenza and its consequences; it does not prevent every cough, cold, or fever.

Check with a licensed clinic or healthcare professional about the vaccine offered locally, the recommended timing, and whether your age, pregnancy, immune condition, or long-term illness affects the choice. Share your allergy history and any previous serious vaccine reaction. Bring a list of regular medicines. After vaccination, follow the clinic's advice about observation and care of the injection site.

Seek emergency help for breathing difficulty, swelling of the face or throat, widespread hives, collapse, or sudden severe weakness after vaccination. Contact a clinician if you become very unwell, have a persistent high fever, or develop symptoms that are worsening rather than settling. A seasonal vaccine decision should be reviewed promptly if you have an acute illness or a history of a severe vaccine reaction.

Ask which seasonal flu vaccine is suitable, when protection is expected to develop, and whether you should wait because of an illness. Confirm how to report a reaction and whether your medical history changes the vaccination plan.