title: Genetically stable temperature-sensitive mutants of Salmonella typhi induce protection in mice.
abstract: Temperature-sensitive (ts) mutants of Salmonella typhi were isolated following treatment with nitrosoguanidine, and characterized with respect to cut-off temperature, ts phenotype and reversion frequency. Linkage of the ts mutations to selectable chromosomal markers was established by generalized transduction with bacteriophage phage Vi I, and the appropriate antibiotic resistances were transduced into the ts mutants. Multiple mutant S. typhi were then constructed by combining three independent ts mutations in one strain, utilizing linkage of three of the mutations to erythromycin-, streptomycin- and methylglyoxal-resistance. Several recombinants are genetically stable, with calculated reversion rates of less than 10(-22), and induce both protection from intraperitoneal challenge with the virulent parental wild-type S. typhi in mice and the formation of antibodies to the somatic O-9 and O-12, the flagellar H and the capsular Vi antigens.
authors.affiliation: International Center for Interdisciplinary Studies of Immunology, Georgetown University School of Medicine, Washington, DC 20007.
authors.forename: A M
authors.initials: AM
authors.lastname: Hooke
authors.forename: M C
authors.initials: MC
authors.lastname: Cerquetti
authors.forename: B J
authors.initials: BJ
authors.lastname: Zeligs
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Hoberg
authors.forename: J A
authors.initials: JA
authors.lastname: Bellanti
mesh_terms: D000818:Animals; D007114:Immunization; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009154:Mutation / Q000235:genetics; D010641:Phenotype; D012485:Salmonella typhi / Q000235:genetics* / Q000276:immunology*; D012680:Sensitivity and Specificity; D013696:Temperature; D014435:Typhoid Fever / Q000276:immunology / Q000517:prevention & control*; D014436:Typhoid-Paratyphoid Vaccines / Q000235:genetics* / Q000627:therapeutic use*; D014613:Vaccines, Attenuated / Q000627:therapeutic use
chemical_list: D014436:Typhoid-Paratyphoid Vaccines; D014613:Vaccines, Attenuated