title: [Detection of HBsAg in the feces of viral hepatitis B patients by longitudinal studies].
mesh_terms: D005243:Feces / Q000276:immunology*; D006509:Hepatitis B / Q000453:epidemiology / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D008137:Longitudinal Studies
chemical_list: D006514:Hepatitis B Surface Antigens