EFFECTIVENESS OF IVERMECTIN AGAINST LATER 4TH-STAGE STRONGYLUS-VULGARIS IN PONIES

  • 1 January 1982
    • journal article
    • research article
    • Vol. 43  (9) , 1525-1529
Abstract
Pony foals (12) were reared worm-free and inoculated with S. vulgaris. Approximately 8 wk after they were inoculated, 6 foals were given ivermectin i.m. at a dosage rate of 200 .mu.g/kg of body weight and 6 were given a placebo. All foals were necropsied 35 days after treatment. Invermectin was 98.9% effective in eliminating later 4th-stage S. vulgaris larvae located near the origin of major intestinal arteries and in reducing clinical signs and permitting resolution of lesions associated with verminous arteritis. One pony foal reared on pasture and with evidence of arteritis of the cranial mesenteric and ileocolic arteries on arteriography was treated with ivermectin at a dosage rate of 200 .mu.g/kg of body weight. On arteriographs taken subsequently, there was evidence of regression of the lesion, and at necropsy 9 wk after treatment, there was no arteritis or larvae in those arteries.

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