title: [Kinetics of fecal excretion of Escherichia coli K99+ by calves after experimental infection].
abstract: Complete kinetics of fecal excretion of K99+ E. coli in colibacillary diarrhoea of young calves is not known. Six calves received two liters of colostrum as a first meal and UHT sterilized milk later. They were kept in isolators. When one week old, they received orally 2.5 X 10(10) to 9.8 X 10(10) K99+ E. coli which are able to grow on adonitol. These bacteria numbered on a minimal medium with adonitol were excreted at a level between 10(5) to 10(8)/g of feces during about eight days. Calves a few weeks old might be healthy carriers of K99+ E. coli and contaminate newborn calves which are highly sensitive to enterotoxigenic colibacillary diarrhoea.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D003967:Diarrhea / Q000382:microbiology / Q000662:veterinary*; D004926:Escherichia coli / Q000254:growth & development / Q000302:isolation & purification*; D004927:Escherichia coli Infections / Q000662:veterinary*; D005243:Feces / Q000382:microbiology*; D012400:Rotavirus Infections / Q000382:microbiology / Q000662:veterinary
vernacular_title: Cinétique d'excrétion fécale de Escherichia coli K99+ par des veaux après infection expérimentale.