Community worker distributing drugs to treat river blindness, or onchocerciasis, and malaria. River blindness is caused by the larvae of the parasitic roundworm Onchocerca volvulus, which is transmitted to humans via the bites of infected Simulium sp. black flies. Malaria is caused by the presence of Plasmodium sp. parasites in the blood. The parasites are spread by the bites of infected female Anopheles sp. mosquitoes. Photographed in Kyenjojo, Uganda.