title: Differences between antigen negative and antigen positive hepatitis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D005260:Female; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006525:Hepatitis, Viral, Human / Q000276:immunology*; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D006514:Hepatitis B Surface Antigens