Neutralization test for BK virus: plaque reduction detected by immunoperoxidase staining

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• BK virus (BKV) is a human polyomavirus that can cause disease in immunocompromised individuals.
• Detecting BKV-specific neutralizing antibodies is crucial for monitoring infection and immune status.
• Conventional neutralization assays can be time-consuming, especially for viruses with slow cytopathic effects.

Purpose of the Study:

• To develop and validate an immunoperoxidase staining test for detecting BKV structural antigens.
• To assess the utility of this test in measuring the neutralizing activity of human and animal sera against BKV.
• To compare the performance of the immunoperoxidase neutralization test with traditional serological methods.

Main Methods:

• Development of an immunoperoxidase staining assay for BKV structural antigens in Vero cell cultures.
• Testing of human and immunized animal sera for BKV neutralizing activity using the developed assay.
• Comparison of results with hemagglutination inhibition (HI) and enzyme-linked immunosorbent assay (ELISA) for BKV IgG detection.

Main Results:

• The immunoperoxidase staining test successfully detected BKV structural antigens.
• Sera positive for BKV antibodies by HI and ELISA demonstrated neutralization capacity in the immunoperoxidase assay.
• A high correlation was observed between HI titers, ELISA IgG levels, and immunoperoxidase neutralization titers.

Conclusions:

• The immunoperoxidase staining test is a reliable method for assessing BKV neutralizing antibodies.
• This assay offers a viable alternative to conventional neutralization tests, particularly for slowly cytopathogenic viruses.
• The findings support the use of immunoperoxidase staining as an efficient diagnostic tool in virology.