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Hundreds of Burundians fleeing the political tensions in their country are pouring into neighboring Tanzania. More than 90,000 Burundians have fled the country, according to the U.N.’s refugee agency the UNHCR. But new challenges are emerging, with about 3,000 refugees infected in a cholera epidemic. UNHCR says up to 400 new cases of the deadly disease are emerging every day, mainly in Tanzania’s Kagunga peninsula where tens of thousands of Burundians have taken refuge, many in squalid conditions