SPRINGFIELD, Ill. - Dr. Eric E. Whitaker, state public health director, today reported that two suburban Cook County residents are the latest Illinoisans to be identified this year with West Nile disease.

Dr. Whitaker said the cases are:

• a 54-year-old man, who became ill Sept. 15, was hospitalized with West Nile encephalitis and has since been discharged.
• a 45-year-old woman, who became ill Sept. 17, was treated for West Nile encephalitis, but did not require hospitalization.

So far this year, the state has recorded 28 cases of the mosquito-borne disease, including one death - a 78-year-old woman from suburban Cook County who passed away Tuesday. The cases have been from the city of Chicago (2), suburban Cook County (11), DuPage County (2), Sangamon County (3) and one each from Champaign, DeKalb, LaSalle, Macon, Macoupin, McLean, Piatt, St. Clair, Vermilion and Whiteside counties.

In 2002, Illinois had the most West Nile disease cases in the nation with 884 and, as of this date last year, the state had reported 614 human cases and 35 deaths.

Although temperatures have cooled recently, Dr. Whitaker reminded Illinoisans it was still important to follow simple, common sense precautions to reduce the chance of mosquito bites until their area experiences a sustained hard freeze (27 degrees F or less for several hours). Until a hard freeze kills the mosquitoes, some will remain and may bite during warm fall daylight hours, especially in areas near dense vegetation where they hide.

Suggested precautions include:

• Whenever outdoors between dusk and dawn, wear shoes and socks, long pants and a long-sleeved shirt. Loose-fitting, light colored clothing is best.
• When it is necessary to be outdoors, apply insect repellent as indicated on the repellent label. The more DEET a product contains, the longer the repellent can protect against mosquito bites. However, concentrations higher than 50 percent do not increase the length of protection. For most situations, 10 percent to 25 percent DEET is adequate. Apply repellents to clothes whenever possible; apply sparingly to exposed skin if label permits. Consult a physician before using repellents on young children.
• Check residential screens, including those on porches and patios, for tears and other openings. Repair, as necessary, to prevent mosquito entry.
• Eliminate stagnant water in bird baths, ponds, flowerpots, wading pools, old tires and any other receptacles in which mosquitoes might breed.

Dr. Whitaker said - while there is reason for concern - few people (about 1 in 150) will develop serious illness if bitten by an infected mosquito.

WNV is transmitted through the bite of a mosquito that has picked up the virus by feeding on an infected bird.

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

A total of 213 birds, 384 mosquito pools and 25 horses have tested positive in 2003 for West Nile virus in 68 Illinois counties since surveillance began May 1. Last year, West Nile activity was reported in 100 of the state's 102 counties.

West Nile virus has been detected in 45 states in 2003 and more than 5,800 human cases have been reported.

The Culex or house mosquito, which can carry West Nile virus or the St. Louis encephalitis virus, breeds in warm, stagnant water and remains active and biting until there is a hard frost, which usually occurs in late October.

Additional information about West Nile virus can be found on the Department's Web site http://www.idph.state.il.us/envhealth/wnv.htm or by calling the Department's West Nile virus hotline at 1-866-369-9710.