Potential risk factors for Cryptosporidium infection in dairy calves

L. P. Garber From USDA:APHIS: National Animal Health Monitoring System, 555 S Howes, Fort Collins, CO 80521

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 DVM, MS
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M. D. Salman the College of Veterinary Medicine and Biological Sciences, Colorado State University, Fort Collins, CO 80521

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 BVMS, PhD
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H. S. Hurd From USDA:APHIS: National Animal Health Monitoring System, 555 S Howes, Fort Collins, CO 80521

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 DVM, PhD
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T. Keefe the College of Veterinary Medicine and Biological Sciences, Colorado State University, Fort Collins, CO 80521

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J. L. Schlater USDA:APHIS: National Veterinary Services Laboratory, Pathobiology Laboratory, Ames, IA 50010.

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 PhD

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Summary

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.

Summary

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.

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