Fever after a tetanus shot

Vaccination teaches the immune system to recognise tetanus-related toxins, and temporary fever, tiredness, headache or soreness at the injection site can accompany that response. These symptoms are not the same as developing tetanus from the vaccine. Fever may instead come from an infection that happened around the same time, including an injury-related problem, so the wound and the person’s general condition still matter.

Rest, drink fluids and wear comfortable clothing. A cool damp cloth can ease local soreness; avoid vigorous rubbing of the injection site. Check the temperature and note when symptoms began. Use paracetamol or another medicine only if suitable for you and according to the label or a clinician’s advice. Do not take extra doses to prevent a reaction, and do not skip future vaccine doses without discussing the schedule with a professional.

Call emergency services for trouble breathing, facial or throat swelling, widespread hives, collapse or severe dizziness after vaccination. Arrange prompt medical assessment for a fever that is high or persistent, an injection site that becomes increasingly red and painful, pus from the wound, difficulty swallowing, jaw stiffness, muscle spasms or a person who is becoming unusually drowsy. Bring the vaccine record and mention any medicines or allergies.

Ask which symptoms are expected, how to care for the injection site, whether your fever medicine is appropriate, when the next tetanus dose is due, and whether the wound needs separate treatment.