Efficacy of Chloroquine, Ivermectin and Artemether on Onchocerca Gutturosa in Zebu calves in Sudan.

Skin microfilarial (mff) densities, adult worm recovery and embryogenesis in gravid female worms were used to evaluate the efficacy of Chloroquine, Ivermectin and Artemether against Onchocerca gutturosa in three groups of five natural y infected zebu calves 2-3 years old. Chloroquine and Artemether were highly effective against both dermal mff and adult worms. Skin mff densities was declined rapidly within two- to three- days of injection and complete clearance occurred thereafter for the fol ow up period (4 months). Four months after the last dose of each drug, the animals were slaughtered and the adult worms examined. Al three drugs showed significant mortality rates i.e. 27%- 32% among adult female worms (