A mosquito pool sampled June 13 in Highland Park has tested positive for West Nile virus and is the first confirmed indicator of West Nile presence in Lake County in 2019. Last year, 72 pools or batches of mosquitoes and two birds tested positive for the West Nile virus. Practice the 4 D’s to protect yourself from mosquitoes: Drain, Defend, Dawn and Dusk, and Dress.