First US Case of Zika Infection by Local Mosquito

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The governor of Florida says four people with the Zika virus appear to have been infected by local mosquitoes -- the first such cases in the continental United States; The UN Syria envoy says Russia's plan to let civilians flee the besieged city of Aleppo requires UN supervision -- and a sustainable ceasefire; Swedish government announces sex study. (Photo: Testing for Mosquito Larvae in Miami, Florida May 2016. Credits: Joe Raedle/Getty Images)