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Canadian Journal of Comparative Medicine logoLink to Canadian Journal of Comparative Medicine
. 1976 Oct;40(4):334–340.

Strongyle infections in ponies. II. Reinfection of treated animals.

H J Smith
PMCID: PMC1277560  PMID: 1000397

Abstract

Five of seven ponies whose strongyle worm burdens had previously been removed or markedly reduced by repeated thiabendazole treatments were reinfected with doses ranging from 100,000 to 500,000 small strongyle infective larvae. Reinfection of ponies resulted in the development of clinical signs characterized by abnormal feces, marked loss of weight and delayed shedding of winter hair coats. An abrupt increase in circulating eosinophils occurred during the first three weeks following reinfection. Patent infections developed in all ponies with worm eggs appearing in the feces from 12 to 15 weeks after receiving infective larvae. Worm egg outputs followed a cyclic pattern with approximately four to five peaks in egg output per year. There was an abrupt drop in the high worm egg counts in two untreated ponies approximately two and a half years after reinfection. No worms were recovered in the feces of these animals when they were subsequently treated, suggesting that a depletion in the number of inhibited larvae present in these ponies might have occurred.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. ARCHER R. K., POYNTER D. Anaemia and eosinophilia associated with helminthiasis in young horses. J Comp Pathol. 1957 Apr;67(2):196–207. doi: 10.1016/s0368-1742(57)80019-8. [DOI] [PubMed] [Google Scholar]
  2. Round M. C. The prepatent period of some horse nematodes determined by experimental infection. J Helminthol. 1969;43(1):185–192. doi: 10.1017/s0022149x00004016. [DOI] [PubMed] [Google Scholar]
  3. Smith H. J. Strongyle infections in ponies. I. Response to intermittent thiabendazole treatments. Can J Comp Med. 1976 Oct;40(4):327–333. [PMC free article] [PubMed] [Google Scholar]

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