Two-hundred and seventy million of pepole are infected with this parasite. This slide shows a patient in chronic stage of the disease.

Two pictures on this panel show elephantiasis of scrotum (above) and an "Ukio-e" painted by Hokusai Katsushika, one of the famous painter in Edo era (left)

Microfilariae of Onchocerca volvuls are causative of blindness (middle).