title: Infectivity in hepatitis B surface antigen (Australia antigen) positive patients.
mesh_terms: D002353:Carrier State; D003813:Dentistry; D006509:Hepatitis B / Q000635:transmission*; D006514:Hepatitis B Surface Antigens / Q000302:isolation & purification; D006801:Humans
chemical_list: D006514:Hepatitis B Surface Antigens