Diphtheria, acellular pertussis and tetanus: what to know

Diphtheria can cause a coating in the throat and release a toxin that harms the body. Pertussis, also called whooping cough, can cause prolonged bouts of coughing. Tetanus produces painful muscle stiffness after bacteria enter a wound. The acellular pertussis component uses selected bacterial parts rather than whole pertussis bacteria.

A combined vaccine reduces the number of injections while building protection against all three infections. Protection can fade, so the timing of routine doses and later boosters depends on age, previous vaccination, pregnancy and local guidance. It does not treat an infection that is already established.

Bring any vaccination record to a clinician and explain previous reactions, immune problems, pregnancy or current illness. If a dose was missed, ask for a catch-up plan rather than restarting the schedule yourself. Mild soreness, tiredness or a short-lived fever can occur after vaccination; rest, fluids and advice from a pharmacist may help.

Vaccination is one part of prevention. Cover coughs, wash hands and avoid close contact with someone who has a suspected contagious cough or throat infection. Suspected diphtheria or pertussis requires medical assessment, testing and infection-control advice; antibiotics may be used for treatment or to reduce spread in selected cases.

Seek urgent care for difficulty breathing, a bluish colour, severe weakness, trouble swallowing, rapidly worsening throat swelling or repeated coughing that interrupts breathing. After vaccination, urgent help is needed for facial or throat swelling, widespread hives, collapse or breathing difficulty.

Ask which dose is due, whether a booster is relevant, how pregnancy or a past reaction changes the plan, and what symptoms should prompt an examination.