What should you know about quadrivalent influenza vaccine?

The quadrivalent influenza vaccine helps the immune system prepare for selected influenza strains and is given as an injection. Suitability and timing depend on factors such as age, pregnancy, medical conditions, allergies, and seasonal guidance. It is designed for influenza prevention; it does not prevent every respiratory infection.

The vaccine presents inactivated influenza material to the immune system, allowing it to develop a targeted response without causing influenza infection. Protection develops after vaccination rather than immediately. Mild soreness, tiredness, headache, or a short-lived fever may follow. Tell a healthcare professional about any reaction that feels severe or does not settle.

Share your allergy history, previous vaccine reactions, current illness, pregnancy status, and medicines with the vaccinator. Ask whether your personal health conditions change the recommended timing or product. Wear a sleeve that can be moved easily and remain for observation if requested. Keep the vaccination record and ask when seasonal vaccination should be reviewed.

Call emergency services for breathing difficulty, throat or facial swelling, widespread hives, collapse, or severe dizziness after the injection. Seek medical advice for persistent fever, marked weakness, or symptoms that are worsening rather than settling. If you become unwell later, the cause may be unrelated to influenza vaccination and should be judged by the symptoms.

Ask: Is this vaccine appropriate for my age and health? Have I had a serious reaction to a vaccine before? Should I wait because I am currently unwell? Which symptoms after vaccination need urgent help?