Atlas of livestock parasites
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Stephanofllaria stliesi



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Stephanofllaria stliesi

General Description:
Small nematodes. up to 8.5 mm in length.

L1fe Cycle:
Unknown; thought to be indirect. The horn fly, Haematobia irritans, is the intermediate host of Stephanofilaria stilesi in the United States.

Geographical Distribution:
Distribution limited to North America - Hawaii, Canada and USA.

Animals tend to rub lesions, making them worse. Skins of carcasses are unfit for sale.

Effect on Host:
Worms live in outer layers of skin, causing inflammation and destruction of hair follicles and skin glands. Raised areas or papules develop, from which fluid and blood may ooze. Papules join to make large lesions which may reach 25 cm. in diameter. Itching causes the host to rub the lesions, aggravating them. Hair loss can result.

Diagnostic Information:
Larvae or microfilariae may be found in tissue near the lesion.

Control horn flies. Protect cattle from flies. Treat lesions with ointment.


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