Onchocerca spp.
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Horses:
ONCHOCERCA SPECIES
General
- One species, O. cervicalis (= O.reticulata).
- Large filarial nematode (<30cm); ligamentum nuchae (and limb connective tissue).
Life-Cycle
- Indirect LC, similar to that fo cattle Onchocerca (which are different species).
- Intermediate host = midge (Culicoides species).
Pathogenicity
- Limited significance.
- Localised hypersensitivity (oedematous) reaction - to dead/dying microfilariae along ventral abdominal midline (sometimes occurs after ivermectin treatment for general worm control).
- Corneal opacity (very rare in UK) - associated with microfilariae.
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This article is still under construction. |