Mosquitoes collected at Angel Park and Daingerfield Island in Alexandria have tested positive for West Nile virus, the first discovery of the illness in the city in 2011.
No human cases of West Nile have been reported in Alexandria yet this year. The discovery comes a day after the District of Columbia announced that infected mosquitoes had been found in the city.
Alexandria recorded two human cases in 2010.
The Alexandria Health Departmenet is working with the Alexandria Department of Recreation, Parks and Cultural Activities and the National Park Service to reduce mosquito breeding in the two areas. Mosquito breeding usually peaks during hot weather.