Risk of Drinking-water Outbreaks of Cryptosporidiosis in Humans Caused by Cattle in Watersheds

Authors

  • Daryl V. Nydam Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
  • Gabbi Lindergard Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
  • Susan E. Wade Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
  • Stephanie L. Schaaf Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
  • Hussni O. Mohammed Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853

DOI:

https://doi.org/10.21423/aabppro20025037

Keywords:

Cryptosporidium paruum, watersheds, contamination, C. paruum genotype

Abstract

There are at least two genotypes of Cryptosporidium paruum in nature-one that has only been isolated from humans (the H genotype) and one that has been isolated from a large range of mammals, including cattle and humans (the C genotype). By virtue of their presence in watersheds and the potential for water contamination with manure, cattle have often been implicated as a source of oocysts for human outbreaks of cryptosporidiosis.

A recent review of drinking-water outbreaks in North America indicated that none in the United States and only one in British Columbia, Canada were associated with the C genotype. Thus, the objective of this study was to determine prevalence of C. paruum genotypes Hand C in dairy herds in the New York City Watershed (NYCW) and illustrate the risk posed by cattle to water-drinkers in this area.

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Published

2002-09-26

Issue

Section

Research Summaries - Dairy I

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