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Updated: Sep 16, 2026
Optimization of a Quantitative Micro-neutralization Assay
Published on: December 14, 2016
Assay of poliomyelitis neutralizing antibody in disposable plastic panels
Abstract:
A method for titration of poliomyelitis neutralizing antibodies in disposable plastic panels is described. This method is a modification of those reported from the laboratories of Salk and of McLean, in which antibody is measured by protection of monkey-kidney cell suspensions from the metabolic inhibitory influence of the polioviruses.White polystyrene panels, inexpensive and commercially available, are sterilized by alcohol or ultraviolet light. Only 20,000 to 30,000 passage cells are used per cup. The cell suspension is obtained by treatment of primary kidney cultures with a chelating agent, Versene. Such passage cells have a more uniform metabolic activity than trypsinized cells obtained directly from monkey kidney. Cell suspensions may be stored in the refrigerator for up to three weeks and still prove useful for the colour test. They are standardized for each test by a prior titration of their viability, the results of which are available in less than 24 hours. Both for the primary outgrowth from trypsinized monkey kidney and for the colour test itself, the simple lactalbumin hydrolysate medium is used. Panels are sealed with a paraffin oil of high viscosity.
Insights
This study presents a refined titration method for poliomyelitis neutralizing antibodies using disposable plastic panels. The enhanced technique ensures reliable antibody measurement by protecting monkey kidney cells from poliovirus effects.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Titration of poliomyelitis neutralizing antibodies is crucial for vaccine efficacy assessment.
- Existing methods require optimization for efficiency and cell culture standardization.
Purpose of the Study:
- To describe a modified, cost-effective method for titrating poliomyelitis neutralizing antibodies.
- To enhance the reliability and reproducibility of antibody measurements using disposable panels.
Main Methods:
- Utilized disposable white polystyrene panels sterilized by alcohol or UV light.
- Employed Versene-treated monkey kidney passage cells for consistent metabolic activity.
- Stored cell suspensions for up to three weeks, standardizing viability before each test.
Main Results:
- Achieved reliable antibody titration with minimal cell usage (20,000-30,000 cells/cup).
- Demonstrated stable cell suspension viability for up to three weeks.
- Validated the use of a simple lactalbumin hydrolysate medium and high-viscosity paraffin oil for panel sealing.
Conclusions:
- The modified method offers a practical and economical approach to poliomyelitis antibody titration.
- Disposable panels and standardized cell suspensions improve assay consistency.
- This technique facilitates accurate assessment of poliovirus neutralizing antibody levels.
