SPRINGFIELD, IL – – Three new human cases of West Nile virus illness have been confirmed in Illinois, bringing to 19 the number of cases reported so far this year in the state, Dr. John R. Lumpkin, state public health director, today announced.

The new cases are –

• A 34-year-old man from Cook County. His onset of symptoms was Aug. 16. Whether the man was hospitalized is not known at this time.
• A 44-year-old man from DuPage County, who is hospitalized with West Nile encephalitis. His onset of symptoms was Aug. 17
• A 40-year-old woman from DuPage County, who is hospitalized with West Nile encephalitis. Her onset of symptoms was Aug. 18.

Once again, Dr. Lumpkin noted that the current level of West Nile virus activity in the state makes it likely there will be additional human cases. Most people who get infected with West Nile virus will have either no symptoms or mild symptoms, but a few individuals may have a more severe form of the disease, such as encephalitis or meningitis.

Dr. Lumpkin again urged people throughout Illinois to take some simple steps to protect themselves and their families from mosquito bites:

• Stay indoors 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. Loose-fitting, light colored clothing is best.
• Use mosquito repellent containing 25 percent to 35 percent DEET when it is necessary to be outdoors, 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 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.

A total of 406 birds, 236 mosquito batches and 23 horses in 85 Illinois counties have tested positive this year for West Nile virus since surveillance for the mosquito-transmitted virus began May 1.

The state's other human cases were from Chicago (4), suburban Cook County (7), DuPage County (1), Madison County (1), Sangamon (1) and Will County (2). A 67-year-old man from DuPage County is the state's only West Nile virus illness death.

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.

The Culex or house mosquito, which can carry West Nile virus or St. Louis encephalitis virus, breeds in warm, stagnant water and begins to increase in numbers early in the summer. Hot, humid weather conditions in recent weeks have been ideal for breeding the Culex mosquito and, as a result, there has been a jump in the number of positive birds, horses and mosquitoes.

Hospitals and infectious disease physicians have been notified of the increase in detection of birds, mosquitoes and horses with West Nile virus and reminded to order tests for arbovirus infections for patients with appropriate symptoms.

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. West Nile virus illness in Illinois has been reported in people ranging in age from 2 to 85, but serious 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_data_02.htm.