title: Emergence of Salmonella typhi Vi antigen-negative strains in an epidemic of multidrug-resistant typhoid fever cases in Calcutta, India.
authors.forename: M R
authors.initials: MR
authors.lastname: Saha
authors.forename: T
authors.initials: T
authors.lastname: Ramamurthy
authors.forename: P
authors.initials: P
authors.lastname: Dutta
authors.forename: U
authors.initials: U
authors.lastname: Mitra
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis* / Q000235:genetics; D002648:Child; D018432:Drug Resistance, Multiple; D006801:Humans; D007194:India / Q000453:epidemiology; D011135:Polysaccharides, Bacterial / Q000032:analysis* / Q000235:genetics; D012485:Salmonella typhi / Q000276:immunology / Q000302:isolation & purification*; D014435:Typhoid Fever / Q000188:drug therapy / Q000453:epidemiology / Q000382:microbiology*
chemical_list: D000942:Antigens, Bacterial; D011135:Polysaccharides, Bacterial