Effectiveness of oxfendazole against early and later 4th-stage Strongylus vulgaris in ponies.
Twenty pony foals (reared worm free), 6.5 to 10 weeks of age, were inoculated with Strongylus vulgaris and allocated to 5 groups, each with 4 foals. One week after inoculation, 1 group of 4 foals was given oxfendazole (OFZ) at a dosage rate of 10 mg/kg of body weight, another group was given 2 such treatments 48 hours apart, and a 3rd group was given a placebo. All treatments were administered by stomach tube. Three weeks later, foals were euthanatized and necropsied in a test for efficacy against early 4th-stage larvae. Oxfendazole was 80% and 94.9% effective against early 4th-stage S vulgaris with 1 and 2 doses, respectively. A 4th group of 4 foals was given 2 treatments of OFZ, 48 hours apart, about 8 weeks after inoculation, and a 5th group was given a placebo. These foals were euthanatized and necropsied 5 weeks after treatment in a test for efficacy against later 4th-stage larvae. Two doses of OFZ were 96.6% effective against later 4th-stage larvae.
D000818:Animals; D000969:Antinematodal Agents / Q000627:therapeutic use*; D001562:Benzimidazoles / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D006736:Horses; D013319:Strongyle Infections, Equine / Q000188:drug therapy* / Q000473:pathology; D013320:Strongyloidea / Q000187:drug effects / Q000254:growth & development
D000969:Antinematodal Agents; D001562:Benzimidazoles; C011030:oxfendazole