title: Salmonella enterica serotype Typhimurium DT104 isolated from humans, United States, 1985, 1990, and 1995.
abstract: First isolated from an ill person in 1985, multidrug-resistant Salmonella enterica serotype Typhimurium DT104 emerged in the mid-1990s as a strain of Salmonella frequently isolated from humans in the United States. We compared the integron content, plasmid profile, and XbaI pulsed-field gel electrophoresis (PFGE) patterns of multidrug-resistant S. Typhimurium DT104 (MR-DT104) isolated from humans in the United States in 1985, 1990, and 1995. All isolates contained a 60-mDa plasmid and had indistinguishable PFGE and integron profiles, supporting the idea of a clonal relationship between recent and historical isolates. The data suggest that the widespread emergence of MR-DT104 in humans and animals in the 1990s may have been due to the dissemination of a strain already present in the United States rather than the introduction of a new strain.
authors.affiliation: National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
authors.forename: Efrain M
authors.initials: EM
authors.lastname: Ribot
authors.forename: Rachel K
authors.initials: RK
authors.lastname: Wierzba
authors.forename: Frederick J
authors.initials: FJ
authors.lastname: Angulo
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Barrett
mesh_terms: D024901:Drug Resistance, Multiple, Bacterial; D006801:Humans; D011159:Population Surveillance; D015995:Prevalence; D012480:Salmonella Infections / Q000453:epidemiology* / Q000382:microbiology*; D012486:Salmonella typhimurium / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D012703:Serotyping; D014481:United States / Q000453:epidemiology