Exterior view, at the edge of a river: a physician is examining a lump on the chest of a young boy; two other boys are standing nearby. Verso: WHO/9946. AFRO. Onchocerciasis. Vhad. More than 20 million people are victims of onchocerciasis in various parts of the world. It is a realtively little known disease which frequently leads to blindness and can force people away from fertile agricultural valleys in an attempt to escape the disease as well as the flies that carry it. Because onchocerciasis occurs near running water, it is also known as "river blindness". Nodules or lumps in the skin produced by the parasitic worms are one of the early signs of onchocerciasis.
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World Health Organization; Source: Record; Research date: 20151016