Figure 2From: Repeated high doses of avermectins cause prolonged sterilisation, but do not kill, Onchocerca ochengiadult worms in African cattleMean number (× 1000) of embryonic stages 'o' (small and large morulae, horseshoe and pretzel stages) and intra-uterine mf of O. ochengi per nodule, over-laid with the number of pathological stages '■'calculated from the median percent of pathological forms before and up to 24 months following treatment with ivermectin or doramectin.Back to article page