This study deals with transmission exsperiments of Trichostrongylus probo lurus from camels to lambs. The effect of this worm on lambs was studied. No apparent clinical signs or post-mortem lesions were detected. Haemato logical parameters showed moderate eosinophilia, but no signs of anaemia were observed during the course of infection. The morphology of the adult worm and the infective larvae was also studied. The efficacy of Ivermectin (lvomec-MSD), administered subcutaneously at a dose rate of 200 mg/kg body weight to these experimentaily infected lambs against Trichostrongylus probolurus was investigated. The drug was found to be 100% effective against this worm.