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Outbreak of poliomyelitis in South Africa investigated by oligonucleotide mapping
C W Tsilimigras1, E Rossouw, B D Schoub
1National Institute for Virology, University of the Witwatersrand Medical School, Johannesburg, Republic of South Africa.
Abstract:
An outbreak of paralytic poliomyelitis, due to polio type 1 virus, occurred in the Gazankulu region of the Transvaal in the Republic of South Africa in 1982. Thirty-four different isolates from this epidemic were characterized by oligonucleotide mapping. None of the isolates were shown to be vaccine related. Results suggest the existence of a number of apparently different wild-type viruses present in the area. The introduction of a single wild-type strain could not be clearly demonstrated. These findings have important implications for the management and control of future outbreaks.
Insights
A 1982 paralytic poliomyelitis outbreak in South Africa involved diverse wild-type polio viruses, not vaccine strains. This finding impacts strategies for controlling future polio epidemics.
Area of Science:
- Virology
- Epidemiology
- Public Health
Background:
- Poliomyelitis outbreaks pose significant public health challenges.
- Understanding the genetic diversity of polioviruses is crucial for effective control.
Purpose of the Study:
- To characterize the poliovirus isolates from a 1982 paralytic poliomyelitis outbreak in South Africa.
- To determine the relationship of these isolates to vaccine strains and identify the circulating wild-type viruses.
Main Methods:
- Oligonucleotide mapping was used to analyze 34 different poliovirus type 1 isolates.
- Genetic characterization of viral strains.
Main Results:
- None of the 34 isolates were vaccine-related.
- The results suggest the presence of multiple distinct wild-type poliovirus strains in the Gazankulu region.
- Evidence for the introduction of a single wild-type strain was not clearly demonstrated.
Conclusions:
- The 1982 outbreak was caused by diverse wild-type poliovirus strains, not vaccine strains.
- The genetic diversity has implications for the management and control of future poliomyelitis outbreaks.
- Further research into the epidemiology of wild polioviruses in the region is warranted.