The Illinois Department of Public Health has confirmed the first West Nile virus positive mosquito batches reported in southern Illinois for 2013. Positive mosquito samples were collected on June 24th in Perry County and in St. Clair County. A mosquito sample collected in Cook County in May was the first West Nile virus positive result this year. Surveillance for West Nile virus in Illinois includes laboratory tests on mosquito batches, dead crows, blue jays, robins and other birds, as well as testing sick horses and humans with West Nile-like symptoms. People who observe a sick or dying crow, blue jay, robin or other bird should contact their local health department, which will determine if the bird should be picked up for testing. West Nile virus is transmitted through the bite of a mosquito that has picked up the virus by feeding on an infected bird. Additional information about West Nile virus can be found on the Illinois Department of Public Health’s Web site at www.idph.state.il.us/envhealth/wnv.htm.