How effective is childhood immunisation for diphtheria?

Diphtheria is a bacterial infection whose toxin can damage the throat and other organs. Vaccination exposes the immune system to a safe form of the target so it can build a protective response without causing diphtheria. Protection is built through the recommended childhood schedule, and later doses may be advised to maintain it.

No vaccine removes every possibility of infection, and a vaccinated child can still need assessment after a concerning exposure or symptom. Immunisation makes severe toxin-related illness less likely and supports community protection when children follow the local schedule.

Keep the child's vaccination record available and ask the healthcare professional to check which dose is due, including any catch-up plan after a missed appointment. Tell them about previous reactions, allergies, immune conditions and medicines. After vaccination, observe your child as advised and seek help for a severe or rapidly worsening reaction.

Seek urgent medical care for difficulty breathing, fainting, swelling of the face or throat, or a rapidly spreading reaction after an injection. A child with a severe sore throat, difficulty swallowing, noisy breathing, marked weakness or a thick coating in the throat needs prompt assessment, especially after possible exposure.

Ask which diphtheria-containing vaccine is due, whether your child needs catch-up doses, what reactions are expected, and what symptoms require urgent help. Discuss the timing of vaccination if your child is currently ill or has a relevant medical condition.