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Chorioptes infestation (chorioptic mange)

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Synonym(s): Scaly leg, leg mange

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Introduction

  • Parasitic skin disease; more common in heavy breeds due to feathering.
  • Cause: mange miteChorioptes equi.
  • Signs: irritation of the distal limbs.
  • Diagnosis: skin scrapes taken from edge of lesions.
  • Treatment: ectoparasiticides.
  • Prognosis: may need on-going treatment - prone to repeat bouts of disease.

Pathogenesis

Etiology

  • Chorioptes equi= Chorioptes bovis var equi.

Predisposing factors

General
  • Heavy breeds with thick feathering on limbs.
  • Winter.

Pathophysiology

  • Mites   Chorioptes equi: mite 01  live on skin surface and are non-burrowing.
  • Small crusty lesions are pruritic and can include self-trauma; excoriation and alopecia may also be seen.
  • The disease can spread up over the rump and onto the body if left untreated.
  • Transmission can be direct or via bedding, etc.
  • The mites are non-invasive, living in the superfical layers of the skin. Irritation is caused by their movement.

Timecourse

  • Life cycle is approximately 2-3 weeks.

Epidemiology

  • Mites hatch and develop to adults in approximately 2-3 weeks.
  • Mites are capable of surviging off the host for up to 69 days.

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Pilsworth R C & Knottenbelt D C (2005) Chorioptic mange. Skin disease refresher. Equine Vet Educ 17 (3), 116-117 Wiley Online Library.
  • Littlewood J (2000) Chorioptic mange - successful treatment of a case with fipronil. Equine Vet Education 12 (3), 144-146 VetMedResource.
  • Curtis C F (1999) Pilot study to investigate the efficacy of a 1 per cent selenium sulphide shampoo in the treatment of equine chorioptic mange. Vet Rec 144, 674-675 PubMed.
  • Littlewood J D (1999) Control of ectoparasites in horses. In Pract.418-424 VetMedResource.
  • Littlewood J D, Rose J & Patterson S (1995) Oral ivermectin paste for the treatment of chorioptic mange in horses. Vet Rec 137 (26), 661-663 PubMed.

Other sources of information

  • Urqhart G M, Armour J, Duncan J L, Dunn A M & Jennings F W (1988) Veterinary Parasitology. Longmann Scientific & Technical. ISBN: 0 5824 0906 3.
  • Rose R J & Hodgson D R (1993) Manual of Equine Practice. Saunders. ISBN: 0 7216 3739 6.
  • Scott D W (1988) Large Animal Dermatology. W B Saunders, USA. 

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