Cross-sectional study of faecal shedding of Giardia duodenalis and Cryptosporidium parvum among packstock in the Sierra Nevada Range

Edward R Atwill, N. K. McDougald, L. Perea

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Faecal specimens from 305 horses and mules used as packstock at one of 17 commercial or governmental (National Park Service, US Forest Service) operations were examined for Giardia duodenalis and Cryptosporidium parvum using immunofluorescent microscopy. Fourteen packstock (4.6%) were shedding G. duodenalis cysts, with herd-level prevalences ranging 0-22%. Number of packstock in the corral, size of corral and density of packstock in the corral were associated with the odds of shedding G. duodenalis cysts. None of the horses had detectable C. parvum oocysts. Assuming a sensitivity of at least 43% and a specificity of 100% for our assay, the estimated maximum true prevalence of shedding of C. parvum for packstock would be ≤ 2.3% of the population. These data suggest that faecal dispersal of C. parvum on back country watersheds is unlikely with packstock.

Original languageEnglish (US)
Pages (from-to)247-252
Number of pages6
JournalEquine Veterinary Journal
Volume32
Issue number3
StatePublished - May 2000

Keywords

  • Cross-sectional
  • Cryptosporidium parvum
  • Giardia
  • Horse

ASJC Scopus subject areas

  • veterinary(all)

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