title: Prevalence of hepatitis B-associated delta agent among mentally retarded carriers of HBsAg.
mesh_terms: D002353:Carrier State; D003673:Defective Viruses / Q000032:analysis*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006525:Hepatitis, Viral, Human / Q000382:microbiology*; D006778:Hospitals, Psychiatric; D006801:Humans; D008607:Intellectual Disability / Q000382:microbiology; D008107:Liver Diseases / Q000382:microbiology
chemical_list: D006514:Hepatitis B Surface Antigens