A photomicrograph revealing the histology of Onchocerca volvulus developing in a Black Fly, Simulium ochraceum.
O. volvulus, the filarial parasite responsible for causing Onchocerciasis , River Blindness, is transmitted to its human host through the bite of Simulium spp. flies such as the Black Fly.
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Some of the images on this website are in the public domain.