Is the influenza vaccine live?

Live refers to the vaccine technology, not to an active influenza infection. The weakened virus is prepared to stimulate the immune system, commonly through a nasal route in products where that formulation is available. It is different from an inactivated vaccine, which uses virus material that cannot replicate. Neither type treats influenza after symptoms begin. Vaccination reduces the chance of illness but does not cover every cause of a cough or fever. Influenza itself can bring fever, chills, headache, cough, fatigue and a general feeling of being unwell. Pneumonia is a more serious chest complication that can sometimes follow a respiratory infection.

Tell the vaccinator about pregnancy, a weakened immune system, serious allergies, long-term medical conditions and medicines you take. Ask which formulation is suitable for your age and health. Follow the product instructions about nasal administration and contact with people who have severely weakened immunity. Mild nasal symptoms, headache, tiredness or a low fever can occur after vaccination. Rest, drink fluids and use only symptom medicine that a clinician or pharmacist considers suitable for you. Keep a note of when you were vaccinated and report an unexpected reaction to the service that provided it.

Seek urgent medical help for trouble breathing, swelling of the face or throat, fainting, severe weakness, blue or grey lips, confusion or rapidly worsening illness after vaccination. Contact a clinician promptly if fever persists, a cough becomes severe, chest pain develops or you are concerned about pneumonia. A routine appointment can clarify whether current chills, fatigue or feeling generally unwell are from influenza, another infection or a vaccine reaction.

Which influenza vaccine formulation fits my health history? Should I delay vaccination because I am currently unwell? Are there medicines or immune conditions that change the advice? What symptoms should prompt a same-day call?