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Onchocerciasis, the Neck Thread Worms and Midline Dermatitis in Horses

Description
This use to be a common cause of skin irritation and bumps in horses. The introduction of ivermectin however has made its incidence increasingly uncommon. Onchocerca is a common parasite of horses. The adult parasites live in the connective tissues of the horse, though they usually cause little trouble. The adults release microfilaria, a larval form, into the blood. These larvae concentrate at the skin. The larvae is then transmitted to other horses by biting flies. There they circulate to the connective tissues, become adults and begin producing more microfilaria (mf).





Onchocerciasis in the eye of a horse.

Additional information


Onchocerca is a common parasite of horses. The adult parasites live in the connective tissues of the horse, though they usually cause little trouble. The adults release microfilaria, a larval form, into the blood. These larvae concentrate at the skin. The larvae is then transmitted to other horses by biting flies. There they circulate to the connective tissues, become adults and begin producing more microfilaria (mf).
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