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Parameters for plaque formation in the potency assay of Japanese measles vaccines
A Fukuda1, F Sengün, H E Sarpay
1Department of Virus Disease and Vaccine Control, National Institute of Health, Tokyo, Japan.
Abstract:
Parameters for plaque formation by measles vaccine strains licensed in Japan were studied. For the plaque test, inoculum volume was one of the critical factors for obtaining an appropriate titre of the sample. A linear relationship between the inoculum volume and the apparent reciprocal titre was discovered, enabling the comparison of absolute titres. Another factor affecting the infectivity was the strain-specific temperature sensitivity in the plaque assay. Although all the vaccine strains tested showed the highest titre at 35 degrees C, the pattern of the temperature sensitivity differed from one strain to another. These factors must be taken into consideration in order to obtain an appropriate titre of a vaccine virus.
Insights
Optimizing measles vaccine plaque assays requires careful control of inoculum volume and temperature. Understanding these factors ensures accurate vaccine virus titration for effective immunization programs.
Area of Science:
- Virology
- Vaccinology
- Microbiology
Background:
- Measles vaccine efficacy relies on accurate viral titration.
- Standardized plaque assays are crucial for vaccine quality control.
Purpose of the Study:
- To identify critical parameters for measles vaccine plaque formation.
- To establish methods for accurate vaccine virus titration.
Main Methods:
- Investigated plaque formation using measles vaccine strains licensed in Japan.
- Analyzed the impact of inoculum volume and temperature on plaque assay results.
Main Results:
- Inoculum volume showed a linear relationship with apparent reciprocal titre, allowing absolute titre comparison.
- Measles vaccine strains exhibited strain-specific temperature sensitivity in plaque assays, with optimal titres at 35°C.
Conclusions:
- Inoculum volume and temperature sensitivity are key factors for accurate measles vaccine titration.
- Consideration of these parameters is essential for reliable vaccine virus quantification and quality assurance.