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Poliovirus strain characterization: a WHO memorandum
Abstract:
Reliable laboratory techniques for the intratypic characterization of poliovirus types 1, 2, and 3 isolates have an important role in the epidemiological surveillance of poliomyelitis and in studies of the safety and efficacy of poliovirus vaccines. Of the techniques available for poliovirus strain characterization, those potentially most useful are intratypic serodifferentiation and the biochemical techniques. The value of strain-specific (absorbed) antisera for antigenic characterization of strains has been clearly established for the identification of both vaccine-like viruses and different epidemic wild strains. Single-radial-diffusion techniques appear to be promising and should be further explored. Biochemical techniques involving studies of both virus polypeptides and nucleic acids are also capable of providing valuable information for strain characterization. Biological and physico-chemical tests are generally of limited value but their application may be useful in certain circumstances.
Insights
Reliable laboratory methods for poliovirus characterization are crucial for polio surveillance and vaccine studies. Serodifferentiation and biochemical techniques offer the most promise for identifying vaccine and wild poliovirus strains.
Area of Science:
- Virology
- Epidemiology
- Immunology
Background:
- Intratypic characterization of poliovirus is essential for epidemiological surveillance of poliomyelitis.
- Accurate strain identification is critical for assessing the safety and efficacy of poliovirus vaccines.
Purpose of the Study:
- To review and evaluate laboratory techniques for the intratypic characterization of poliovirus types 1, 2, and 3.
- To identify the most useful methods for distinguishing between vaccine-like and wild poliovirus strains.
Main Methods:
- Review of available laboratory techniques including serodifferentiation and biochemical methods.
- Evaluation of the utility of strain-specific antisera and single-radial-diffusion techniques.
- Assessment of biochemical techniques involving virus polypeptides and nucleic acids.
Main Results:
- Strain-specific (absorbed) antisera are valuable for antigenic characterization, identifying vaccine-like and wild poliovirus strains.
- Single-radial-diffusion techniques show promise for poliovirus strain characterization.
- Biochemical techniques analyzing polypeptides and nucleic acids provide significant information for strain characterization.
Conclusions:
- Intratypic serodifferentiation and biochemical techniques are the most valuable methods for poliovirus strain characterization.
- Further exploration of single-radial-diffusion techniques is recommended.
- While generally of limited value, biological and physico-chemical tests may be useful in specific circumstances.