The dull patch in a victim's eye shows where the parasitic worm transmitted by the black-fly's bite has caused irreparable damage. The only real answer to onchocerciasis is to wipe out the fly wherever there are human settlements
Close-up of an eye. Verso: Who/18017. AFRO. Onchocerciasis. SM 10-1979.
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World Health Organization; Source: Record; Research date: 20151020