Children cross a polluted canal in Port-au-Prince, Haiti, January 26, 2016. Zika outbreaks have been reported in Haiti. The virus is spread by the Aedes aegypti mosquito, which is notoriously adaptive. The insect thrives in puddles, nooks and crannies common in tropical cities peppered with chaotic and unplanned neighbourhoods, where rainwater, open sewers and litter offer ample habitat. (Photo by Andres Martinez Casares/Reuters)
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