title: Fimbriae and enterotoxins associated with Escherichia coli serogroups isolated from pigs with colibacillosis.
abstract: A comprehensive study of 223 Escherichia coli isolates from pigs with colibacillosis included determination of O serogroups, detection of heat-labile enterotoxin, heat-stable enterotoxin (STa and STb), and identification of K88, K99, 987-P, F-41, and type 1 fimbriae. The incidence of the various E coli types among isolates of pigs of different ages was also determined. Escherichia coli bearing K88 fimbriae accounted for 48% of all isolates studied, were most often of serogroup O157, O149, or O8, and usually produced labile toxin alone or in combination with STa or STb. These E coli were commonly isolated from pigs in each age group studied (0 to 5 days, 6 to 10 days, 11 to 24 days, and greater than 24 days). Escherichia coli bearing 987-P accounted for 30% of the isolates, were most often of serogroup O141 or O20, and usually produced STa. Escherichia coli bearing K99 accounted for 13% of the isolates, usually were of serogroup O101 or O8, and almost always produced STa. Escherichia coli bearing 987-P or K99 were most often isolated from pigs less than 6 days of age. Fimbriae F-41, when identified, were usually on E coli of serotype O101:K99. Although infrequently found, type 1 fimbriae were on E coli of most of the serogroups identified in this study.
authors.forename: R A
authors.initials: RA
authors.lastname: Wilson
authors.forename: D H
authors.initials: DH
authors.lastname: Francis
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D004768:Enterotoxins / Q000032:analysis*; D004926:Escherichia coli / Q000145:classification* / Q000472:pathogenicity / Q000648:ultrastructure; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary*; D010861:Fimbriae, Bacterial / Q000648:ultrastructure*; D012703:Serotyping; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology*
chemical_list: D004768:Enterotoxins