Paper II
2024 August (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Polio vaccines

Q122 marksShort Notes

Answer

Polio vaccines:

  • Oral Polio Vaccine (OPV) — live attenuated, trivalent (now bivalent, following wild poliovirus type 2 eradication); induces both systemic (IgG) and local intestinal mucosal (secretory IgA) immunity, important for interrupting faecal-oral transmission; mainstay of global eradication campaigns.
  • Inactivated Polio Vaccine (IPV) — killed vaccine, given by injection; induces systemic immunity without any risk of vaccine-associated paralytic poliomyelitis (a very rare complication of OPV).

Schedule: OPV given at birth and as part of the primary series (6, 10, 14 weeks); IPV co-administered in many current programmes; booster doses later in childhood. Supplementary Immunization Activities (“Pulse Polio” rounds) provide additional OPV doses to all children under 5 in endemic/high-risk countries.

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