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Municipal workers wait before spraying insecticide at Sambodrome in Rio de Janeiro, Brazil, January 26, 2016. Municipal workers sprayed insecticide around Sambadrome, where the city's Carnival takes place every year, and where the archery competitions will take place during the Rio Olympics. The operation is part of the city's effort to prevent the spread of Zika's vector, the Aedes aegypti mosquito, according to a statement from Municipal Health Secretary.  Pilar Olivares / Reuters