Occurrence and persistence of "Australia" antigen determinants

Area of Science:

• Hepatology
• Immunology
• Virology

Background:

• Australia (Au) antigen is a marker for Hepatitis B virus (HBV) infection.
• Understanding the determinants of Au antigens aids in characterizing HBV strains and their epidemiology.

Purpose of the Study:

• To investigate the presence and distribution of d and y determinants in Australia (Au) antigens.
• To compare detection methods for the y determinant.
• To assess the persistence and specificity of Au antigenic profiles in different populations.

Main Methods:

• Analysis of Australia (Au) antigens from 214 individuals for d and y determinants.
• Utilized antibody absorption and spur formation assays for determinant detection.
• Examined sera from Tongan and Californian populations, including healthy individuals, hospital inmates, heroin users, and hepatitis patients.

Main Results:

• All 214 individuals possessed either the d or y determinant, in addition to the a determinant.
• Antibody absorption was more effective than spur formation for detecting the y determinant.
• Au antigens with ad specificity were common in Tongan sera, while ay specificity predominated in Californian groups.
• Antigenic specificities remained stable over 3 years in Tongan children and persisted in chronic carriers and hepatitis patients.

Conclusions:

• Australia (Au) antigens consistently carry either d or y determinants.
• The ay specificity is prevalent in diverse Californian populations.
• Au antigen specificities demonstrate remarkable stability over time and in various clinical conditions.