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A focus assay method for Japanese encephalitis virus using complement and anti-virus serum.
Microbiology and Immunology
|January 1, 1985
Summary
A new focus assay provides sensitive, rapid, and reproducible quantification of Japanese encephalitis (JE) virus infectivity. This method efficiently titrates multiple flaviviruses, including JE virus, and works well with cell lines resistant to plaque formation.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- Accurate titration of viral infectivity is crucial for research and diagnostics.
- Traditional plaque assays can be time-consuming and may not be suitable for all cell lines or viruses.
Purpose of the Study:
- To develop a sensitive, quantitative, rapid, and reproducible focus assay for Japanese encephalitis (JE) virus.
- To evaluate the assay's efficacy for titrating various flavivirus strains and its applicability to different cell lines.
Main Methods:
- Infected cells were incubated for 2-3 days.
- Treatment with anti-JE virus serum and complement.
- Staining with trypan blue to visualize clear foci.
Main Results:
- The assay successfully quantified infectivity for all seven JE virus strains tested.
- The method also effectively titrated West Nile (WN), Murray Valley encephalitis (MVE), and St. Louis encephalitis (SLE) viruses using anti-JE virus serum.
- Cell lines that were poor plaque formers using agar overlay methods readily produced foci with this new assay.
Conclusions:
- A novel, rapid, and sensitive focus assay for JE virus has been established.
- This method offers a versatile tool for titrating multiple flaviviruses and is effective across various cell types.
- The assay provides a valuable alternative to plaque assays, particularly for difficult-to-culture cell lines.