title: Edema disease caused by a clone of Escherichia coli O147.
abstract: Edema disease is a systemic disease of weaned pigs caused by host-adapted strains of Escherichia coli, most commonly belonging to serogroup O138, O139, or O141. In the late 1990s, E. coli O147 strains containing the virulence genes f18, sta, stb, and stx(2) were recovered from outbreaks of edema disease in the United States. Pulsed-field gel electrophoresis (PFGE) was used to determine that the majority of these strains (34/43) were closely related to one another. Subsequent analysis by multilocus restriction typing confirmed the PFGE results and indicated that the cluster of edema disease strains were only distantly related to other E. coli O147 strains. Serogrouping of edema disease isolates from the Iowa State University Veterinary Diagnostic laboratory recovered between 1996 and 2000 indicated that 42% belonged to serogroup O147. Our data suggest that these strains may be a common serotype of edema disease-causing E. coli in the United States.
authors.affiliation: Department of Veterinary Microbiology, Iowa State University, 2130 Vet. Med. Bldg., National Animal Disease Center, Ames, 50011-1250, USA.
authors.forename: Amy F
authors.initials: AF
authors.lastname: Helgerson
authors.forename: Vijay
authors.initials: V
authors.lastname: Sharma
authors.forename: Amie M
authors.initials: AM
authors.lastname: Dow
authors.forename: Regina
authors.initials: R
authors.lastname: Schroeder
authors.forename: Karen
authors.initials: K
authors.lastname: Post
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Cornick
mesh_terms: D000818:Animals; D004196:Disease Outbreaks / Q000662:veterinary*; D004488:Edema Disease of Swine / Q000453:epidemiology / Q000382:microbiology*; D016521:Electrophoresis, Gel, Pulsed-Field; D004926:Escherichia coli / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D029968:Escherichia coli Proteins / Q000235:genetics; D015995:Prevalence; D015183:Restriction Mapping; D012703:Serotyping; D022641:Shiga Toxin 2 / Q000235:genetics; D013552:Swine / Q000382:microbiology; D014774:Virulence
chemical_list: D029968:Escherichia coli Proteins; D022641:Shiga Toxin 2