title: Cattle as a possible source of verocytotoxin-producing Escherichia coli O157 infections in man.
abstract: In May-June 1992 cases of infection with verocytotoxin-producing (VT+) Escherichia coli O157 in South Yorkshire could have been associated with prior consumption of beef from a local abattoir. During investigation of the abattoir, bovine rectal swabs and samples of meat and surface swabs from beef carcasses were examined for E. coli O157, isolates of which were tested for toxigenicity, plasmid content and phage type. E. coli O157 was isolated from 84 (4%) of 2103 bovine rectal swabs; of these 84, 78 (93%) were VT+, the most common phage types being 2 and 8, the types implicated in the cluster of human cases. Positive cattle were from diverse sources within England. E. coli O157 was isolated from 7 (30%) of 23 carcasses of rectal swab-positive cattle and from 2 (8%) of 25 carcasses of rectal swab-negative cattle. The study has shown that cattle may be a reservoir of VT+ E. coli O157, and that contamination of carcasses during slaughter and processing may be how beef and beef products become contaminated and thereby transmit the organism to man.
authors.affiliation: Public Health Laboratory, Sheffield.
authors.forename: P A
authors.initials: PA
authors.lastname: Chapman
authors.forename: C A
authors.initials: CA
authors.lastname: Siddons
authors.forename: D J
authors.initials: DJ
authors.lastname: Wright
authors.forename: P
authors.initials: P
authors.lastname: Norman
authors.forename: J
authors.initials: J
authors.lastname: Fox
authors.forename: E
authors.initials: E
authors.lastname: Crick
mesh_terms: D000003:Abattoirs; D000818:Animals; D001427:Bacterial Toxins / Q000096:biosynthesis* / Q000235:genetics; D001483:Base Sequence; D002353:Carrier State / Q000382:microbiology / Q000662:veterinary; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D003603:Cytotoxins / Q000096:biosynthesis / Q000235:genetics; D017931:DNA Primers / Q000737:chemistry; D004197:Disease Reservoirs; D004768:Enterotoxins / Q000096:biosynthesis / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000302:isolation & purification* / Q000472:pathogenicity; D004927:Escherichia coli Infections / Q000382:microbiology* / Q000635:transmission; D005243:Feces / Q000382:microbiology; D005260:Female; D005516:Food Microbiology; D006801:Humans; D008297:Male; D008460:Meat / Q000382:microbiology*; D008969:Molecular Sequence Data; D022622:Shiga Toxin 1
chemical_list: D001427:Bacterial Toxins; D003603:Cytotoxins; D017931:DNA Primers; D004768:Enterotoxins; D022622:Shiga Toxin 1