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Mosquitoes that transmit dengue fever are spreading across the US. But outbreaks of the disease are only occurring in some areas, and scientists are trying to find out why. Scientists are particularly concerned about the emergence of the virus in Jenson Beach, Florida. It means that dengue fever is spreading north from Key West, where one of the earliest outbreaks in the US was recorded in 2009. Previously there had been no outbreaks of the fever in Florida for decades. [Source: BBC News]
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