New Mosquito-Borne Diseases in U.S.
Dengue fever is one of two mosquito-borne illnesses that have Florida health officials increasingly worried about a major outbreak. The other one is West Nile virus, which first showed up in the United States in 1999 and quickly moved south. Last year, 53 of Florida?s 67 counties were under medical alert for the virus.
Now officials worry that dengue fever will also spread to Florida. In recent years, there have only been about four cases a year, all imported by people who had were bitten in other countries.
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