Potential risk factors for Cryptosporidium infection in dairy calves.
Fecal samples from 7,369 calves on 1,103 farms were examined for cryptosporidia in a nationwide survey, using monoclonal antibody technique. Cryptosporidium oocysts were found in calves from 652 (59.1%) of the farms and in 1,648 (22.4%) of the tested calves. Almost half the calves between 7 and 21 days of age had cryptosporidia in their fecal samples. Prevalence was highest during the summer. Farms with multiple-cow maternity facilities and farms with > 100 milking cows were the most likely to have calves with cryptosporidia.
Garber
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LP
USDA:APHIS: National Animal Health Monitoring System, Fort Collins, CO 80521.
Salman
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MD
Hurd
H S
HS
Keefe
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Schlater
J L
JL
D017677:Age Distribution; D000818:Animals; D000833:Animals, Suckling; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D003457:Cryptosporidiosis / Q000453:epidemiology*; D003458:Cryptosporidium / Q000302:isolation & purification; D005243:Feces / Q000469:parasitology; D005260:Female; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology / Q000662:veterinary*; D016015:Logistic Models; D015995:Prevalence; D012307:Risk Factors; D012621:Seasons; D014481:United States / Q000453:epidemiology