title: A long-term study on the prevalence of shiga toxin-producing Escherichia coli (STEC) on four German cattle farms.
abstract: The occurrence of Shiga toxin-producing Escherichia coli (STEC) was studied on four cattle farms. STEC were detected in 29-82% of the cattle. STEC with additional EHEC markers were detected on all farms. The occurrence of the complete virulence marker pattern (stx1 and/or stx2, eae, EHEC(hlyA), katP, espP) was correlated with the presence of known STEC serotypes. STEC O26:H11 and O165:H25 with the complete pattern of virulence markers were the most prevalent. STEC O157 (H7/H-) STEC O103:H2 and STEC O145:H- were found sporadically. Five clonal subgroups of the STEC O26:H11 isolates were identified by pulsed-field gel electrophoresis. STEC O26:H11 were present in three groups of cattle. This serotype was detected in a single group over the entire fattening period. Most STEC O26:H11 with the complete pattern of potential virulence markers were found in clinically healthy cattle. These animals may represent a risk factor for farmers and consumers.
authors.affiliation: Bundesforschungsanstalt für Viruskrankheiten der Tiere, Institut für epidemiologische Diagnostik, Wusterhausen, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Geue
authors.forename: M
authors.initials: M
authors.lastname: Segura-Alvarez
authors.forename: F J
authors.initials: FJ
authors.lastname: Conraths
authors.forename: T
authors.initials: T
authors.lastname: Kuczius
authors.forename: J
authors.initials: J
authors.lastname: Bockemühl
authors.forename: H
authors.initials: H
authors.lastname: Karch
authors.forename: P
authors.initials: P
authors.lastname: Gallien
mesh_terms: D000818:Animals; D015415:Biomarkers; D002417:Cattle / Q000382:microbiology*; D004926:Escherichia coli / Q000145:classification / Q000302:isolation & purification* / Q000472:pathogenicity; D008826:Microbial Sensitivity Tests; D015995:Prevalence; D012703:Serotyping; D022621:Shiga Toxin / Q000096:biosynthesis*; D014774:Virulence
chemical_list: D015415:Biomarkers; D022621:Shiga Toxin