SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Filiaria skin lesion resulting from River Blindness (Onchocerciasis). It is the second leading infectious cause of blindness in the world. It is caused by Onchocerca volvulus, a parasitic nematode that can live up to fifteen years in the human body. It is transmitted through the bite of a black fly. The worms then spread throughout the body. When they die, they cause intense itching and a strong immune system response that can destroy nearby tissue, such as the eye.
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