Solid-phase enzyme-immunoassay for detection of hepatitis B surface antigen

Area of Science:

• Hepatology
• Virology
• Immunodiagnostics

Background:

• Hepatitis B virus (HBV) infection remains a significant global health concern.
• Accurate and accessible diagnostic tools for hepatitis B surface antigen (HBsAg) are crucial for disease management.
• Solid-phase enzyme-immunoassay (EIA) offers a potential alternative to radioimmunoassay (RIA) for HBsAg detection.

Purpose of the Study:

• To present preliminary results of a solid-phase enzyme-immunoassay (EIA) for HBsAg detection.
• To compare the performance of EIA with the established solid-phase radioimmunoassay (RIA) for HBsAg.
• To evaluate the sensitivity and specificity of EIA across different HBsAg subtypes and patient cohorts.

Main Methods:

• Comparison of EIA and RIA methods using dilution series of HBsAg positive sera.
• Validation against four national reference panels from the Netherlands, USA, and West Germany.
• Longitudinal study involving weekly monitoring of 14 patients with acute viral hepatitis B over 16 weeks.

Main Results:

• EIA demonstrated favorable sensitivity and specificity compared to RIA, irrespective of reading method (visual or colorimetric).
• Minor variations in sensitivity were observed between EIA and RIA for specific HBsAg subtypes (ad and ay).
• EIA showed potentially slightly lower sensitivity for subtype ad and slightly higher for subtype ay compared to RIA.

Conclusions:

• Solid-phase EIA is a highly sensitive and specific method for HBsAg detection, comparable to RIA.
• The observed minor sensitivity differences may be attributed to the specific antisera used in each assay.
• EIA presents a promising, non-radioactive alternative for routine HBsAg screening and diagnosis.