The parasite that causes onchocerciasis, or river blindness, is spread by repeated bites of infected Simulium blackflies. This neglected tropical disease (NTD) is present in Africa and the Americas. Shown here are blackflies attempting to bite through the shirt of a CDC microbiologist on a trip to Guatemala. #WorldSightDay #BeatNTDs #MakeVisionCount #onchocerciasis #riverblindness : @cdcglobal














