FILE - This is a Tuesday, Jan. 26, 2016 file photo of health workers as they get ready to spray insecticide to combat the Aedes aegypti mosquitoes that transmits the Zika virus under the bleachers of the Sambadrome in Rio de Janeiro, which will be used for the Archery competition in the 2016 summer games. With the opening ceremony just over two months away, Olympic leaders have plenty of challenges to discuss this week when they meet for the last time before gathering in Rio de Janeiro on the eve of South America’s first games. (AP Photo/Leo Correa, File)
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