What should you know about inactivated influenza vaccine (IIV)?

The vaccine uses virus material that cannot multiply in the body. After vaccination, your immune system recognises influenza targets and prepares protective antibodies. The injection does not give you influenza, although a sore arm, tiredness, headache, or a mild fever can occur as your immune system responds. Protection develops after vaccination and can vary between people and influenza strains.

Tell the vaccinator about previous vaccine reactions, severe allergies, current illness, pregnancy, and medicines or health conditions that affect immunity. Remain at the clinic for the advised observation period. Keep the injection site comfortable with ordinary movement and fluids; use a medicine for discomfort only if it is suitable for you and used as directed. Follow the schedule recommended for your age and health needs.

Seek urgent medical help for trouble breathing, swelling of the face or throat, widespread hives, fainting that does not settle, or severe weakness after vaccination. Contact a clinician for a high or persistent fever, worsening symptoms, or a reaction that concerns you. A mild sore arm or short-lived tiredness usually needs observation and simple comfort measures.

Ask which influenza vaccine schedule fits your age and medical history, whether a previous reaction changes your options, and how to plan vaccination around another appointment or vaccine.