title: Epidemiology of onchocerciasis. Report of a WHO Expert Committee.
mesh_terms: D000349:Africa; D002489:Central America; D006801:Humans; D008800:Mexico; D009855:Onchocerciasis / Q000175:diagnosis / Q000453:epidemiology* / Q000517:prevention & control; D013020:South America; D014944:World Health Organization; D015006:Yemen