A mosquito pool (batch of mosquitoes) sampled on June 13 in Highland Park, Illinois has tested positive for West Nile virus. The mosquito pool is the first confirmed indicator of West Nile presence in Lake County in 2019. 

Residents are urged to drain standing water near their homes or businesses, use insect repellent when outdoors, be especially cautious at dawn and dusk, and cover skin with long sleeves, pants and closed-toed shoes when outdoors.