title: Escherichia coli strains isolated from diarrheic piglets in the Province of Quebec.
abstract: During 1972 to 1974, 112 Escherichia coli strains isolated from diarrheic piglets were recieved from different parts of the Province of Quebec, Canada. Fifty-six strains elicited a positive gut loop response in three week old piglets and were then considered as Moon's class 1 enteropathogens, while four of the 56 remaining strains reacted only in ten day old piglets and were classified as class 2 enteropathogens. Forty-eight strains produced both a heat-labile and a heat-stable enterotoxin, while 12 isolates which included the four class 2 enteropathogens produced only a heat-stable enterotoxin. Fifty-one enterotoxigenic strains could be serogrouped using OK antisera against E. coli strains commonly associated with colibacillosis in piglets. The most common serogroups encountered were O157: K "V17"; 88a,c, O149:K91; 88a.c. O157:K"V1c, O149:K91; 88a.c, O157:K"V17"; 88 a,c or a,b and O45:K"E5"; 88a,c. No significant difference was observed in the fermentation patterns, antibiotic susceptibility, colicin production, production of a filterable hemolysin and transferable tetracycline resistance between the enterotoxigenic and the nonenterotoxigenic strains.
mesh_terms: D000818:Animals; D006224:Cricetinae; D003967:Diarrhea / Q000276:immunology / Q000662:veterinary*; D004768:Enterotoxins / Q000032:analysis; D004926:Escherichia coli / Q000302:isolation & purification*; D004927:Escherichia coli Infections / Q000662:veterinary*; D007106:Immune Sera; D011792:Quebec; D011817:Rabbits; D013552:Swine; D013553:Swine Diseases / Q000276:immunology / Q000382:microbiology*
chemical_list: D004768:Enterotoxins; D007106:Immune Sera