A modified immunofluorescence test for Epstein-Barr virus-specific IgM antibody

Area of Science:

• Virology
• Immunology
• Medical Diagnostics

Background:

• Epstein-Barr virus (EBV) causes infectious mononucleosis.
• Accurate detection of EBV-specific IgM antibodies is crucial for diagnosis.
• Existing diagnostic methods may have limitations in sensitivity or specificity.

Purpose of the Study:

• To enhance the fluorescent antibody (FA) test for detecting Epstein-Barr virus (EBV)-specific IgM antibodies.
• To improve antigen expression and remove interfering antibodies for more reliable results.
• To evaluate the diagnostic utility of the improved EBV-IgM-FA test in a clinical setting.

Main Methods:

• Utilized sodium butyrate to increase EBV antigen expression in P3HR-1 cells.
• Adsorbed test sera with Sepharose-IgG and Streptococcus pyogenes to remove rheumatoid factor (RF) and IgG antibodies.
• Compared the improved EBV-IgM-FA test with the Paul-Bunnell (PB) test on 1106 clinical samples.

Main Results:

• The enhanced EBV-IgM-FA test demonstrated high concordance (96.4%) with the Paul-Bunnell test.
• The method proved effective for routine diagnostic use in identifying EBV-specific IgM.
• Testing EBV-IgM positive sera by PB aided in detecting cross-reacting IgM antibodies.

Conclusions:

• The improved EBV-IgM-FA test is a reliable and suitable method for routine diagnosis of EBV infection.
• Enhancements in antigen expression and antibody removal increase test accuracy.
• Complementary testing with the Paul-Bunnell test can help resolve potential cross-reactivity issues.