The Virginia Department of Health said the patient was sickened by the mosquito-borne virus but had not recently traveled outside the state. Virginia health officials have confirmed the state’s first known case of locally acquired dengue, a viral disease usually associated with international travel. The Virginia Department of Health said the person, who lives in Northern Virginia, became sick after caring for another Virginia resident who was infected with dengue overseas. For areas like bird baths or decorative ponds, Schwartz said to use mosquito dunks, which will decrease the bugs’ breeding. According to the Virginia Department of Health, the state’s mosquito season typically runs from early May through early November.