title: Letter: Quick test for HBAg using charcoal.
mesh_terms: D000818:Animals; D002606:Charcoal; D006509:Hepatitis B / Q000276:immunology / Q000382:microbiology; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006736:Horses / Q000276:immunology; D006801:Humans; D007106:Immune Sera / Q000032:analysis; D012703:Serotyping
chemical_list: D006511:Hepatitis B Antigens; D007106:Immune Sera; D002606:Charcoal