Write a short note on DPT & Pentavalent Vaccine.

Definition

• DPT protects against diphtheria (toxoid), pertussis (whole-cell or acellular) and tetanus (toxoid).
• In the UIP the primary series is given as the pentavalent vaccine (DPT + hepatitis B + Hib).

Schedule & Route

• Primary series (pentavalent) at 6, 10 and 14 weeks; DPT boosters at 16–24 months and 5–6 years.
• Intramuscular (anterolateral thigh in infants).
• Later tetanus/diphtheria protection is boosted with Td at 10 and 16 years and in pregnancy.

Aefis & Notes

• Local pain/swelling and fever are common (more with whole-cell pertussis); acellular pertussis causes fewer reactions.
• Pertussis component is omitted (DT/Td) if there is a clear contraindication.

Components & Variants

• Whole-cell pertussis (wP) — more reactogenic; acellular pertussis (aP) — fewer reactions.
• DT (no pertussis) for those with a pertussis contraindication; Td (reduced diphtheria) for older children/adults.

Key Points Recap

• Diphtheria/tetanus toxoids + pertussis; given as pentavalent at 6/10/14 weeks; IM.
• Boosters at 16–24 months and 5–6 years; Td later and in pregnancy.

Programme Note

The pentavalent vaccine replaced separate DPT, hepatitis B and Hib injections in the UIP, cutting the number of pricks while broadening protection — a key programmatic improvement.

Exam Relevance

This is a frequently asked short note — remember the vaccine type/route, its place in the UIP schedule, and its key precautions or programmatic significance.

Whole-cell pertussis causes most of the reactogenicity.