Onchocerca spp in Horses (Equis) | Vetlexicon
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Onchocerca spp

ISSN 2398-2977

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Introduction

Classification

Taxonomy

  • Phylum: Nematoda.
  • Superfamily: Filarioidea.
  • Genus:Onchocerca.
  • Species:cervicalis/reticulata.

Distribution

  • Found throughout the world.
  • Appears to be very common in some geographical locations, eg Ohio, USA one survey found 77% of horses to be infected.
  • Ireland no horses found infected.
  • Normandy 1.19% of the horses examined were infected.

Significance

  • Microfilariae   Onchocerca: microfilaria  in the skin and/or eye may cause dermatitis   Skin: onchocerciasis  and/or conjunctivitis.
  • Adult worms were believed to be the cause of 'fistulous withers' - now no longer believed to be the cause.

Active Forms

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Resting Forms

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Clinical Effects

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Diagnosis

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • French D D et al (1988) Efficacy of ivermectin in paste and injectable formulations against microfilariae of Onchocerca cervicalis and resolution of associated dermatitis in horses. Am J Vet Res 49 (9), 1550-1554 PubMed.
  • Moran C T & James E R (1987) Equine ocular pathology ascribed to Onchocerca cervicalis infection: a re-examination. Trop Med Parasitol 38 (4), 287-288 PubMed.
  • Cummings E et al (1985) Prevalence of eqiune onchocerciasis in southeastern and midwestern United States. JAVMA 186 (11), 1202-1203 PubMed.
  • Schmidt G M et al (1985) Onchocerca cervicalis in horses: dermal histopathology. Acta Trop 42 (1), 55-61 PubMed.