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Question: what are the regional spread of onchocerciasis? where the disease onchocerciasis has spread regionally

Answer: In the Western Hemisphere onchocerciasis is largely confined to Mexico and Central America, although cases have been reported from Venezuela, Colombia and Dutch Guina. It is widespread in tropical Africa. In the Americas it occurs principally among persons inhabiting the western slope of the Sierras at altitudes of 600 to 2000 meters. Guatemala and the southern states of Mexico constitute the chief endemic centers. In Africa onchocerciasis is found from Sierra Leone and Liberia southward through the Gulf Coast, Dahomey, Nigeria and the Cameroons to the Congo; then east to the southern Sudan, Uganda, Nyasaland, Kenya, Tanzania and Kavirondo. Recently, it has been reported in southern Arabia.

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