title: An entomologic and parasitologic survey for onchocerciasis in western El Salvador.
mesh_terms: D000818:Animals; D004175:Diptera / Q000469:parasitology; D004544:El Salvador; D006736:Horses / Q000469:parasitology; D006801:Humans; D009855:Onchocerciasis / Q000453:epidemiology* / Q000469:parasitology; D012621:Seasons