Progress towards eliminating onchocerciasis in the WHO Region of the Americas in 2011 : interruption of transmission in Guatemala and Mexico = Progrès accomplis en vue de l’élimination de l’onchocercose dans la Région OMS des Amériques en 2011 : interruption de la transmission au Guatemala et au Mexique
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The World Health Organization (WHO) is the directing and coordinating authority for health within the United Nations system.