title: Characterization of heat-stable enterotoxin from a hypertoxigenic Escherichia coli strain that is pathogenic for cattle.
abstract: An enterotoxigenic Escherichia coli (ETEC) strain isolated from a calf with clinical scours was found to produce over 17- to 60-fold more heat-stable enterotoxin (STa) than four laboratory-adapted bovine ETEC strains. The purified STa of this strain was identical to those produced by other ETEC strains. A severe form of scours was induced in 5- to 15-day-old colostrum-fed calves and in 1- to 2-week-old piglets by oral administration of the purified STa. This study demonstrates that STa is a mediator of diarrhea in newborn calves and piglets and that under identical growth conditions diverse strains of bovine ETEC may produce variable amounts of homologous STa's.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001427:Bacterial Toxins / Q000032:analysis* / Q000633:toxicity; D002417:Cattle / Q000382:microbiology; D002418:Cattle Diseases / Q000382:microbiology*; D003967:Diarrhea / Q000209:etiology / Q000662:veterinary; D004768:Enterotoxins / Q000032:analysis* / Q000633:toxicity; D004926:Escherichia coli / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary*; D029968:Escherichia coli Proteins; D013552:Swine
chemical_list: D000596:Amino Acids; D001427:Bacterial Toxins; D004768:Enterotoxins; D029968:Escherichia coli Proteins; C034151:heat stable toxin (E coli)