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Equine ocular onchocerciasis: histopathologic study

G M Schmidt, J D Krehbiel, S C Coley

    American Journal of Veterinary Research
    |August 1, 1982
    PubMed
    Summary
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    Ocular microfilariae from Onchocerca sp. in horses did not cause obvious clinical issues. Treatment with diethylcarbamazine caused microfilariae to relocate within the eye, increasing inflammation.

    Area of Science:

    • Veterinary Ophthalmology
    • Parasitology
    • Equine Health

    Background:

    • Naturally occurring Onchocerca sp. infections are common in horses.
    • Ocular microfilariae can potentially cause eye abnormalities in equids.

    Purpose of the Study:

    • To investigate clinical and histological abnormalities in equine eyes associated with Onchocerca sp. ocular microfilariae.
    • To evaluate the effect of diethylcarbamazine treatment on ocular microfilariae distribution and associated inflammation.

    Main Methods:

    • Clinical and histological examination of 368 equine eyes.
    • Histological analysis of ocular tissue samples before, during, and after diethylcarbamazine treatment in one horse.

    Main Results:

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  • Microfilariae were found in the conjunctiva of 40 eyes without distinct clinical abnormalities.
  • During treatment, microfilariae migrated from conjunctival to perilimbal corneal stroma.
  • Increased inflammatory cells were observed in perilimbal tissues during treatment.

    • Conclusions:

    • Conjunctival microfilariae of Onchocerca sp. in horses may not be associated with significant clinical abnormalities.
    • Diethylcarbamazine treatment can alter microfilariae location and induce localized inflammation in equine ocular tissues.