[Passive hemagglutination test for Semliki-Forest Virus (author's transl)]

Area of Science:

• Virology
• Immunology
• Biochemistry

Background:

• Passive hemagglutination (PHA) is a serological assay.
• Detecting Semliki Forest virus (SFV) is crucial for disease control.
• Existing methods for SFV detection have limitations.

Purpose of the Study:

• To develop and optimize a passive hemagglutination test for Semliki Forest virus (SFV) detection.
• To evaluate different immunoglobulin coupling methods onto sheep erythrocytes for SFV detection.
• To compare the developed PHA test with other existing methods.

Main Methods:

• Coupling of goat anti-SFV IgG to sheep erythrocytes using various chemical agents.
• Optimization of the glutaraldehyde coupling method (0.25%).
• Detection and titration of SFV using the developed PHA assay.
• Electron microscopy to visualize the agglutination mechanism.

Main Results:

• Glutaraldehyde coupling (0.25%) provided the best results for coupling goat anti-SFV IgG to sheep erythrocytes.
• The optimized PHA test successfully identified and titrated SFV in solutions.
• Electron microscopy confirmed SFV-mediated erythrocyte agglutination via bridge formation.
• The PHA test demonstrated advantages over direct hemagglutination, including detection of formalin-inactivated virus.

Conclusions:

• A robust passive hemagglutination assay using glutaraldehyde-coupled sheep erythrocytes was developed for Semliki Forest virus detection and titration.
• This method offers a sensitive and advantageous approach for assessing the potency of inactivated togavirus vaccines.
• The findings provide a valuable tool for virological diagnostics and vaccine quality control.