Lake County, Ill. — The Lake County Health Department and Community Health Center is reporting the first human case of West Nile virus in Lake County for 2021. A Deerfield resident in his 70s became ill in late-July.

"Take precautions to protect yourself from mosquito bites and West Nile virus,” said Mark Pfister, the Health Department’s Executive Director. “Even as the weather gets cooler, mosquitoes will remain active until the first hard frost.”

To date, 85 pools or batches of mosquitoes have tested positive for West Nile virus in 2021.

Follow the “4 Ds of Defense” to protect yourself and your family from mosquitoes:

• Drain: Drain standing water from items around your home, yard, and business.
• Defend: When outdoors, use an insect repellent containing DEET, picaridin, oil of lemon eucalyptus, 2-undecanone, or IR3535 and reapply according to label directions.
• Dawn to Dusk: Protect yourself all day and night, and wear repellent outdoors during these prime times for mosquito activity.
• Dress: Wear long sleeves, pants, and closed toe shoes when outdoors to cover your skin.

Most people infected with West Nile virus have no symptoms of illness. However, some may become ill usually three to 15 days after the bite of an infected mosquito. Common symptoms include fever, nausea, headache, and muscle aches. In some individuals, severe illness including meningitis or encephalitis, or even death, can occur. People older than 50 years and individuals with weakened immune systems are at higher risk for severe illness from West Nile virus.

Find more prevention tips and information on West Nile virus at www.FightTheBiteNow.com. Residents can also call the Health Department’s West Nile hotline to report areas of stagnant water, report locations of dead birds, and obtain more information on the signs and symptoms of West Nile virus. The West Nile hotline number is (847) 377-8300.