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Epidemiologic aspects of poliomyelitis eradication.
Reviews of Infectious Diseases
|May 1, 1984
Summary
Polio eradication in the US was achieved despite low vaccination rates, thanks to seasonal virus disappearances and fewer reintroductions. Measles eradication proved harder due to higher transmissibility and more frequent reintroductions.
Area of Science:
- Epidemiology
- Infectious Disease Control
- Public Health
Background:
- Mass immunization with oral poliovirus vaccine began in the US in 1963.
- The last natural poliomyelitis outbreak occurred in 1972, with a single re-emergence in 1979.
Purpose of the Study:
- To investigate the factors contributing to the eradication of poliomyelitis in the United States.
- To compare the eradication dynamics of poliomyelitis with measles.
Main Methods:
- Analysis of historical polio and measles outbreak data in the US.
- Evaluation of vaccination coverage, seasonality, and virus reintroduction rates.
Main Results:
- Poliomyelitis eradication was achieved despite 5%-10% of children remaining susceptible.
- Key factors included seasonal winter fade-outs of poliovirus and limited reintroductions.
- Measles, with higher transmissibility and frequent reintroductions, resisted eradication more stubbornly.
Conclusions:
- Seasonal variations and reduced reintroductions were critical for polio eradication.
- Differences in transmissibility and reintroduction frequency explain why measles eradication is more challenging than polio eradication.