When is childhood immunisation recommended for diphtheria?

Diphtheria is a bacterial infection that can affect the throat and breathing passages. Immunisation trains the immune system before exposure and is usually delivered as part of a combined vaccine, so one appointment may protect against several infections. The schedule is designed around childhood age and previous doses rather than symptoms.

The exact product, interval and number of doses can depend on the country schedule, the child’s immunisation record and whether earlier doses were delayed. A child who has missed an appointment may still be able to continue the series; it is not usually necessary to restart it.

Check the child’s vaccination record and contact the child’s clinic or primary-care service to confirm the next dose. Take the record to the appointment so the clinician can match the advice to doses already received. Tell the clinician about a previous serious reaction to a vaccine, a current significant illness, or a condition or medicine that affects immunity.

After vaccination, mild soreness, tiredness or a short-lived temperature can occur. Follow the clinician’s aftercare advice and keep the record updated. A link to [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) explains the wider programme.

Seek urgent medical help if a child has trouble breathing, swelling of the face or throat, becomes unusually floppy or difficult to wake, or has a seizure after vaccination. These reactions need prompt assessment and are different from ordinary injection-site soreness.

If the child develops a persistent high fever, appears seriously unwell, or you are worried about symptoms after an injection, contact a healthcare service promptly. Do not delay urgent care while looking for the vaccination record.

Ask which diphtheria-containing vaccine is due, whether any earlier dose is recorded, and what catch-up plan applies if the schedule was interrupted. You can also ask which reactions are expected, how to prepare for the appointment, and when the next review should occur.