title: In vitro and in vivo assessment of Salmonella enterica serovar Typhimurium DT104 virulence.
abstract: Multidrug-resistant Salmonella enterica serovar Typhimurium phage type DT104 has become a widespread cause of human and other animal infection worldwide. The severity of clinical illness in S. enterica serovar Typhimurium DT104 outbreaks has led to the suggestion that this strain possesses enhanced virulence. In the present study, in vitro and in vivo virulence-associated phenotypes of several clinical isolates of S. enterica serovar Typhimurium DT104 were examined and compared to S. enterica serovar Typhimurium ATCC 14028s. The ability of these DT104 isolates to survive within murine peritoneal macrophages, invade cultured epithelial cells, resist antimicrobial actions of reactive oxygen and nitrogen compounds, and cause lethal infection in mice were assessed. Our results failed to demonstrate that S. enterica serovar Typhimurium DT104 isolates are more virulent than S. enterica serovar Typhimurium ATCC 14028s.
authors.affiliation: Department of Microbiology, North Carolina State University, Raleigh, North Carolina 27695.
authors.forename: C A
authors.initials: CA
authors.lastname: Allen
authors.forename: P J
authors.initials: PJ
authors.lastname: Fedorka-Cray
authors.forename: A
authors.initials: A
authors.lastname: Vazquez-Torres
authors.forename: M
authors.initials: M
authors.lastname: Suyemoto
authors.forename: C
authors.initials: C
authors.lastname: Altier
authors.forename: L R
authors.initials: LR
authors.lastname: Ryder
authors.forename: F C
authors.initials: FC
authors.lastname: Fang
authors.forename: S J
authors.initials: SJ
authors.lastname: Libby
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D017737:Macrophages, Peritoneal / Q000382:microbiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D009566:Nitrates / Q000494:pharmacology; D012480:Salmonella Infections / Q000382:microbiology; D012486:Salmonella typhimurium / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification / Q000472:pathogenicity*; D014407:Tumor Cells, Cultured; D014774:Virulence
chemical_list: D009566:Nitrates; D006861:Hydrogen Peroxide