Equis ISSN 2398-2977

Oxyuris equi

Contributor(s): Roger Connan, Joseph DiPietro, Maggie Fisher, Sheelagh Lloyd

Introduction

Classification

Taxonomy

  • Phylum: Nematoda.
  • Superfamily: Oxyuroidea.
  • Family: Oxyuridae.
  • Genus:Oxyuris.
  • Species:equi.

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Clinical Effects

Epidemiology

Lifecycle

  • Adult worms in intestine.
  • Eggs laid around anus.
  • L3 larvae develops within egg.
  • Egg ingested.
  • Larvae hatches in intestine.
  • L4.

Transmission

  • By ingestion of infective eggs off contaminated fomites.
  • Eggs remain stuck to the perineal area for several days before dropping or being rubbed off onto fomites or bedding.
  • Eggs are very susceptible to dessication and so those outdoors usually die.
  • Heavy infections can occur in stabled horses where eggs are at high concentrations in damp areas such as mangers or bedding.

Pathological effects

  • Adult worms cause pruritus during egg-laying.
  • Horses rub tail area causing damage to hairs of tail head, 'rat-tailed' appearance.
  • L4 larvae may cause inflammation of intestinal mucosa as erosions caused by feeding (rare).

Control

Control via animal

  • Local irritation around anus can be controlled by sponging anal area to remove eggs.

Control via chemotherapies

  • Oxyuris equiis susceptible to most anthelmintics, therefore should be controlled by routine anthelmintic treatments.

USA

UK

Diagnosis

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Reinemeyer C R & Nielsen M K (2014) Review of the biology and control of Oxyuris equiEquine Vet Educ 46 (11), 584-591 VetMedResource. 
  • Stephenson R (2010) Oxyuris equi a resurgent problem? UK Vet 15 (5), 8-10 VetMedResource.
  • Costa A J et al (1998) Comparative efficacy evaluation of moxidectin gel and ivermectin paste against internal parasites of equines in Brazil. Vet Parasitol 80 (1), 29-36 PubMed.
  • Gawor J J (1995) The prevalence and abundance of intestinal parasites in working horses autopsied in Poland. Vet Parasitol 58 (1-2), 99-108 PubMed.

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