The Brief Two locally acquired cases of dengue fever have been confirmed in Hillsborough County, prompting mosquito control officials to step up surveillance and treatment efforts. Unlike most dengue cases seen locally, officials say neither patient recently traveled, suggesting the virus was spread by mosquitoes within Hillsborough County. Two confirmed cases of locally acquired dengue fever in Hillsborough County have mosquito control officials taking action to prevent the virus from spreading further. Unlike the travel-related dengue cases Hillsborough County typically sees each year, officials believe neither patient recently visited an area where dengue is common. Local health officials respondWhat they're saying:Mosquito Management Services spokesperson Gabby Henderson said most dengue cases identified in Hillsborough County are linked to international travel.