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This map of Guatemala shows the three provinces (Sololá, Suchitepéquez, and Chimaltenango) that contribute to the Central Endemic Zone (CEZ) for onchocerciasis in Guatemala. The CEZ (dark polygon) indicates the contiguous parts of the provinces where onchocerciasis transmission took place, just south of Lake Atítlan, in the highlands at elevations from 500 to 1500 m.
