What should you know about diphtheria toxin vaccine?

Diphtheria bacteria can produce a toxin that damages the throat and other organs. The vaccine does not contain a live form of the bacteria; it presents a harmless form of the toxin so the immune system can prepare protective antibodies. Protection is maintained through the schedule recommended for your age and local health programme, which may include booster doses.

A sore arm, mild swelling, tiredness, or a short-lived fever can occur after vaccination. These effects usually settle without treatment. Tell the clinician about previous serious vaccine reactions, a current illness, pregnancy, or medicines that affect immunity.

Check your vaccination record and take it to a clinic or family doctor. If records are missing, the clinician can assess your history and advise whether catch-up doses are appropriate rather than relying on memory. Keep the appointment details and any aftercare advice.

Vaccination is prevention, not treatment for an established throat infection. Someone exposed to diphtheria may need urgent assessment, testing, antibiotics, or additional measures even if they have received vaccines. Read more about [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) and [Antibiotic Treatment](/treatments/medical-management/antibiotic-treatment/).

Seek emergency help for trouble breathing, noisy breathing, inability to swallow saliva, rapidly increasing neck swelling, fainting, or bluish lips. Contact a clinician promptly after close exposure to suspected diphtheria, especially with a sore throat, fever, marked weakness, or a grey coating in the throat.

Ask which doses are documented, whether a booster or catch-up plan is needed, which reactions are expected, and what symptoms should prompt a same-day call. Ask how exposure to suspected diphtheria would change your next steps.