Equis ISSN 2398-2977

Demodectic mange

Synonym(s): Follicular mange, red mange, demodicosis

Contributor(s): Dawn Logas, Rosanna Marsella, Sue Paterson

Introduction

  • Uncommon parasitic skin disease of horses.
  • Cause: mange miteDemodex equiandD. caballi.
  • Signs: scaling, hair loss, papulopustular eruptions.
  • Diagnosis: skin scrapes from lesions.
  • Treatment: ectoparasiticides.
  • Prognosis: good to guarded.

Pathogenesis

Etiology

  • Demodex caballi- long mite found on eyelids or muzzle.
  • Demodex equi- short mite found on body.
  • Commensal skin organism, rarely pathogenic.

Specific

  • Immunosuppression secondary to drugs, eg glucocorticoids, concurrent disease, malnutrition, stress.

Pathophysiology

  • Immunosuppression    →   mites multiply in follicles   →   inflammation   →   folliculitis.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Tarry D (1994) Horse ectoparasite problems in Britain. Equine Vet Educ VetMedResource.
  • Scott D W & White K K (1983) Demodicosis associated with systemic glucocorticoid therapy in two horsesEquine Pract 5, 31 PubMed VetMedResource.
  • Desch C E Jr & Nutting W B (1979) Redescription of Demodex caballi (=D. folliculorum var. equi Railliet, 1895) from the horse, Equus caballusAcarologia 20 (2), 235-240 PubMed.

Other sources of information

  • Rose R J & Hodgson D R (1993) Manual of Equine Practice. Saunders. ISBN: 0 7216 3739 6.
  • 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.


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