Cases of West Nile virus are up 25 % in the past week . Aerial spraying has sometimes been used to control mosquitoes after hurricanes , Petersen said . Officials say they expect cases to continue for several more weeks . There have been no deaths from the mosquito - borne virus .
Cases of West Nile virus are up 25 % in the past week . Officials say they expect cases to continue for several more weeks . There have been no deaths from the mosquito - borne virus .