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Vaccination against poliomyelitis in economically underdeveloped countries
Bulletin of the World Health Organization
|January 1, 1980
Summary
High rates of paralytic poliomyelitis persist in developing nations despite oral poliovirus vaccine (OPV) efforts. Mass OPV campaigns targeting young children are crucial for eradication, overcoming administrative and logistical challenges.
Area of Science:
- Public Health
- Epidemiology
- Vaccinology
Background:
- Paralytic poliomyelitis incidence remains high in developing countries, contrary to previous assumptions.
- Factors like high infant mortality, malnutrition, and poor sanitation contribute to endemic poliomyelitis.
- Existing immunization programs often fail to reach sufficient infant populations for effective polio elimination.
Purpose of the Study:
- To analyze the effectiveness of current poliomyelitis control strategies in underdeveloped regions.
- To identify key factors hindering polio eradication in high-incidence areas.
- To propose optimal vaccination strategies for poliomyelitis elimination.
Main Methods:
- Analysis of poliomyelitis lameness surveys from Burma, Egypt, Ghana, and the Philippines.
- Review of recent data on oral poliovirus vaccine (OPV) effectiveness in diverse settings.
- Evaluation of administrative and programmatic challenges in polio eradication.
Main Results:
- Endemic paralytic poliomyelitis rates are similar to or higher than pre-vaccine era peaks in the USA.
- Prolonged breastfeeding does not reduce OPV effectiveness; multiple doses overcome interference from other enteric infections.
- Routine immunization programs reach only 20-40% of infants, insufficient for polio elimination.
Conclusions:
- Polio eradication in developing countries is primarily an administrative challenge, not immunological.
- Targeted mass administration of OPV to young children is essential for optimal results.
- Mass OPV campaigns, irrespective of prior doses, are more effective than fragmented routine immunizations.