July 17, 2006

Champaign, Lee, Macon, Peoria and Scott Counties – newest counties testing positive for West Nile virus

SPRINGFIELD – Dr. Eric E. Whitaker, state public health director, today announced birds collected in Champaign, Macon, Peoria and Scott counties, and mosquitoes collected in Lee County, are the first positive test results for West Nile virus in these counties this year.

The Illinois Department of Public Health (IDPH) was notified by the Champaign County Health Department of the finding as part of its routine surveillance for West Nile virus. The positive crow sample was collected on July 11 in Champaign. The Lee County Health Department collected a positive mosquito sample in Amboy on July 14. The Macon County Health Department collected a positive Blue Jay on July 10 in Decatur, Peoria County collected a positive Blue Jay on July 7 in Dunlap and Scott County collected a positive Blue Jay on July 10 in Bluffs.

So far this year, West Nile virus in mosquitoes have been found in Adams, Bureau, Champaign, Cook, DuPage, Jackson, Kane, Kankakee, Knox, Lake, LaSalle, Lee, Macon, Macoupin, McHenry, McLean, Sangamon, Stephenson, St. Clair, Will and Winnebago counties. Positive samples in birds have been found in Champaign, Cook, DeKalb, DuPage, DeWitt, Effingham, Ford, Henry, Kankakee, Knox, Lake, LaSalle, Livingston, Macon, Macoupin, McHenry, McLean, Peoria, Sangamon, Scott, Stephenson, Williamson and Winnebago counties.

To date, 30 counties out of 102 have reported positive test results for West Nile Virus all over Illinois.

“Hot weather is forecasted for this week and any increase in temperature can increase the number of mosquitoes, therefore increasing the risk of West Nile virus to humans. People should make sure to take precautions when going outside this weekend,” said Dr. Whitaker. “The best way to prevent West Nile disease or any other mosquito-borne illness is to reduce the number of mosquitoes around your home and to take personal precautions to avoid mosquito bites.”

Precautions to prevent mosquitoes include:

• Avoid being outdoors when mosquitoes are most active, especially between dusk and dawn. Use prevention methods whenever mosquitoes are present.
• When outdoors, wear shoes and socks, long pants and a long-sleeved shirt, and apply insect repellent that includes DEET, picaridin or oil of lemon eucalyptus according to label instructions. Consult a physician before using repellents on infants.
• Make sure doors and windows have tight-fitting screens. Repair or replace screens that have tears or other openings. Try to keep doors and windows shut, especially at night.
• Eliminate all sources of standing water that can support mosquito breeding, including water in bird baths, ponds, flowerpots, wading pools, old tires and any other receptacles. In communities where there are organized mosquito control programs, contact your municipal government to report areas of stagnant water in roadside ditches, flooded yards and similar locations that may produce mosquitoes.

Last year, 57 of the state’s 102 counties were found to have a West Nile positive bird, mosquito, horse or human case. A total of 252 human cases of West Nile disease, including twelve deaths, were reported last year in Illinois.

Surveillance for West Nile virus in Illinois began May 1 and includes laboratory tests on mosquitoes, dead crows, blue jays, robins and other perching birds, as well as the testing of sick horses and humans with West Nile-like disease symptoms. Citizens who observe a sick or dying perching bird should contact their local health department, which will determine if the bird is to 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. 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. The first human case in Illinois is not usually reported until July or later.

Only about two persons out of 10 who are bitten by an infected mosquito will experience any illness. Illness from West Nile is usually mild and includes fever, headache and body aches, but serious illness, such as encephalitis and meningitis, and death are possible. Persons older than 50 years of age have a highest risk of severe disease.

Additional information about West Nile virus can be found on the Illinois Department of Public Health website at www.idph.state.il.us/envhealth/wnv.htm or by calling the West Nile Virus Hotline at 866-369-9710 Monday through Friday from 8:00 am to 5:00 pm.