title: Variation of Vi antigen and its relation to biological properties of Salmonella typhi.
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000302:isolation & purification*; D003086:Bacteriocin Plasmids; D001434:Bacteriophage Typing; D012485:Salmonella typhi / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial