The Brief Hillsborough County health officials have confirmed eight locally-acquired cases of dengue fever, up from two reported last week. Pinellas County has also confirmed two locally-acquired cases, prompting increased mosquito surveillance and treatment in the Palm Harbor area. Health officials are increasing mosquito control efforts across parts of the Tampa Bay area following a jump in locally acquired dengue fever cases. Tampa Bay dengue casesWhat we knowThe Florida Department of Health in Hillsborough County announced an eighth confirmed locally-acquired case of dengue, while Pinellas County health officials have reported two locally-acquired cases. The county says no human cases of West Nile virus have been reported in Pinellas County so far this year.