SPRINGFIELD, IL – Twenty-one new laboratory confirmed cases of West Nile disease were reported today by the Illinois Department of Public Health bringing to 539 the total number of human cases in the state this year from the mosquito-transmitted disease.

Today's cases of West Nile disease include five from the city of Chicago, eight from suburban Cook County, four from DuPage County and one each from Clark, Crawford, Lake and Macoupin counties. So far this year, there have been human cases of West Nile disease in 39 of the state's 102 counties and 29 deaths. Human cases range in age from 3 months to 97 years and the average age is 56.

The state's deaths have been from Chicago (6), suburban Cook County (14) and one each from DuPage, Effingham, Fulton, Knox, Lake, Macon, Madison, Moultrie and Sangamon counties. Cases announced today follow:

CHICAGO: A 64-year-old woman, whose hospital information is not known; an 84-year-old man, who was hospitalized with West Nile encephalitis; a 48-year-old woman, who was hospitalized with West Nile encephalitis; a 47-year-old man, who was hospitalized with West Nile encephalitis; and a 70-year-old woman, whose hospital information is not known.

SUBURBAN (NORTHERN) COOK COUNTY: A 63-year-old woman, who was hospitalized; a 67-year-old man, who was hospitalized with West Nile encephalitis; a 63-year-old man with West Nile fever, who was not hospitalized; and a 54-year-old man, who was hospitalized.

SUBURBAN (SOUTHERN) COOK COUNTY: A 51-year-old woman with West Nile encephalitis, who was not hospitalized; a 63-year-old man, who was hospitalized with West Nile encephalitis; a 37-year-old woman, who was hospitalized; and a 65-year-old man, whose hospital information is not known.

DUPAGE COUNTY: An 83-year-old woman, who was hospitalized with West Nile encephalitis; a 78-year-old woman, who was hospitalized with West Nile encephalitis; a 78-year-old man, who was hospitalized with West Nile encephalitis; and 64-year-old man, who was hospitalized with West Nile encephalitis.

CLARK COUNTY: An 87-year-old man, who was hospitalized with West Nile encephalitis.

CRAWFORD COUNTY: A 66-year-old woman, who was hospitalized with West Nile fever.

LAKE COUNTY: A 75-year-old woman, who was hospitalized.

MACOUPIN COUNTY: A 44-year-old man with West Nile fever, who was hospitalized.

A complete listing of the positive birds, mosquito batches, horses and humans identified so far in Illinois, by county, is available on the Department's Web site at <www.idph.state.il.us>. Go to the West Nile virus page and select "2002" under surveillance.

Dr. Lumpkin continued to urge Illinoisans to take the following steps to reduce the chance of mosquito bites until their area experiences a hard frost:

• Avoid being outdoors at dawn, dusk and early evening when mosquitoes are most active. If outdoors at these times, wear shoes and socks, long pants and a long-sleeved shirt to cover as much of the skin as possible. Loose-fitting, light colored clothing is best.
• Use insect/mosquito repellent containing 25 percent to 35 percent DEET when outdoors when mosquitoes are biting, applied sparingly to exposed skin or clothing, as indicated on the repellent label. Consult a physician before using repellents on young children.
• Check for and repair any holes or tears in residential screens, including porches and patios.
• Eliminate stagnant water in bird baths, ponds, flower pots, wading pools, old tires and any other receptacles in which mosquitoes might breed.

Dr. Lumpkin said most people who get infected with West Nile virus have either no symptoms or mild symptoms, but a few individuals may develop a more severe form of the disease, such as encephalitis or meningitis.

A total of 509 birds, 528 mosquito batches and 415 horses in 98 Illinois counties have tested positive this year for the virus since surveillance for the mosquito-transmitted virus began on May 1.

The Culex or house mosquito, which can carry West Nile virus or St. Louis encephalitis virus, breeds in warm, stagnant water and remains active and biting until there is a hard frost. As the temperatures dip below 60 degrees at night and in early morning, the mosquitoes feeding habits change from seeking blood meals, which they use for reproduction, to sugar meals from plants that help sustain them over winter.

Most people infected with West Nile virus have no clinical symptoms of illness, but some may become ill three to 14 days after the bite of an infected mosquito. Infections can be mild and include fever, headache and body aches, or severe and marked by headache, high fever, neck stiffness, stupor, convulsions, muscle weakness, paralysis and, rarely, death. Serious West Nile virus illness is most often present in individuals 50 years of age or older.

2002 West Nile virus surveillance information can be found on the Department's Web site at www.idph.state.il.us/envhealth/wnvsurveillance_data02.htm.