Dallas County Health and Human Services confirms that mosquito samples collected in Dallas County have tested positive for West Nile virus. The positive samples were collected from the 75115 ZIP code in DeSoto and the 75104 ZIP code in Cedar Hill. West Nile virus is the leading cause of mosquito-borne disease in the continental United States, per the CDC. It most commonly spreads to people through the bite of an infected mosquito. Mosquito seaso…