The Chicago Department of Public Health (CDPH) has confirmed the first West Nile Virus (WNV)-positive mosquito batch in the City for 2019. CDPH will continue to monitor the area where the mosquito batch tested positive. Following additional tests, CDPH will determine the appropriate next steps to be taken. No human cases of WNV have been reported to date in 2019. CDPH began its annual mosquito control activities on May 15th. This includes treating 80,000 catch basins in Chicago with larvicide, which kills immature mosquitoes and is the most effective control strategy. The most effective way to prevent infection from WNV and other mosquito-borne diseases is to reduce the number of mosquitoes around your home and avoid mosquito bites. Residents are encouraged to take personal precautions against mosquitoes:

• Use insect repellant that contains DEET, Picaridin, IR3535 or Oil of Lemon Eucalyptus according to label instructions.

• Eliminate standing water. This includes emptying water from flowerpots, gutters, tires, toys, pet water dishes and birdbaths once weekly.

• Keep grass and weeds short to eliminate hiding places for adult mosquitoes.

• When outside between dusk and dawn, wear loose-fitting, light colored clothing, long pants, long-sleeved shirts, socks and shoes.

For more information about mosquito-borne diseases, including symptoms and prevention, visit www.chicago.gov/health.