title: Prevalence of Cryptosporidium parvum infection in southwestern Ontario and its association with diarrhea in neonatal dairy calves.
abstract: Cryptosporidium parvum infection was detected in 203 (40.6%) of 500 Ontario dairy calves aged 7 to 21 d, on a convenience sample of 51 farms with a history of calf diarrhea. Within-farm prevalence ranged from 0% to 70%, and both shedding and intensity of shedding were significantly associated with diarrhea. This parasite appears to be common in Ontario dairy calves and important as a cause of dairy calf scours in the province.
authors.affiliation: Department of Population Medicine Ontario Veterinary College, University of Guelph, Guelph, Ontario. ltrozwi@uoguelph.ca
authors.forename: Lise A
authors.initials: LA
authors.lastname: Trotz-Williams
authors.forename: Brenna D
authors.initials: BD
authors.lastname: Jarvie
authors.forename: S Wayne
authors.initials: SW
authors.lastname: Martin
authors.forename: Kenneth E
authors.initials: KE
authors.lastname: Leslie
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Peregrine
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000469:parasitology; D003457:Cryptosporidiosis / Q000453:epidemiology / Q000662:veterinary*; D016785:Cryptosporidium parvum / Q000302:isolation & purification*; D003967:Diarrhea / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D005243:Feces / Q000469:parasitology; D005260:Female; D009864:Ontario / Q000453:epidemiology; D010270:Parasite Egg Count / Q000662:veterinary; D015995:Prevalence; D012621:Seasons