Why Isn't Onchocerciasis A Big Blindness Issue In These Two Sierra Leone Villages?
In Sierra Leone, onchocerciasis is a big worry in 14 out of its 16 districts. But two villages in Tonkolili district, Mangobo and Petifu, haven't seen much blindness from this disease. This raised eyebrows because, since 2005, these villages have had 17 rounds of annual treatments with ivermectin, a