A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY
Malnourished boy. View of a malnourished young boy suffering from onchocerciasis (river blindness). His malnourishment is due to this form of filariasis caused by the parasitic tiny worms (microfilariae) of Onchocerca volvulus. The larvae are transmitted from person to person by biting flies which breed in and live around rivers. The larvae grow into adults which produce the tiny worms. Blindness occurs as an allergic reaction when these worms die in or near tissues of the eye. The boy is waiting for treatment with ivermectin, a drug that is highly effective at killing the worms. Photographed in Mali.
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