title: HLA system and its association to chronic hepatitis and persistence of HBsAg in the organism.
mesh_terms: D002353:Carrier State / Q000276:immunology; D002908:Chronic Disease; D006680:HLA Antigens / Q000032:analysis*; D006505:Hepatitis / Q000276:immunology*; D006509:Hepatitis B / Q000276:immunology; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans
chemical_list: D006680:HLA Antigens; D006514:Hepatitis B Surface Antigens