May 13, 2010
First birds in Illinois tests positive for West Nile virus
SPRINGFIELD, ILL. – Dr. Damon T. Arnold, state public health director, today announced the first birds testing positive for West Nile virus in Illinois this year were found in Carroll County and St. Clair County.
“As temperatures start to warm up, we’re going to start seeing more mosquito activity and an increased risk for West Nile virus,” said Dr. Arnold. “Although most cases of West Nile virus are mild, the virus can still cause serious, life-altering and even fatal disease. That is why it is so important to protect yourself against mosquito bites by wearing insect repellent and getting rid of any standing water around your home.”
A house sparrow collected in Lanark, Carroll County, on May 8 and a cowbird collected in Belleville, St. Clair County, on May 10, both tested positive for West Nile virus.
The first bird testing positive for West Nile virus in 2009 was from LaSalle County and was reported on June 5. The first positive mosquito samples were collected May 11 last year in Cook County. No mosquito batches have tested positive for West Nile virus so far this year.
Last year 36 of the state’s 102 counties were found to have a West Nile positive bird, mosquito, horse or human case. A total of five human cases of West Nile disease were reported in Illinois last year, the first reported on August 31.
Surveillance for West Nile virus in Illinois began on May 1 and includes laboratory tests on mosquito batches, 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. People who observe a sick or dying crow, blue jay, robin or other perching bird should contact their local health department, which will determine if the bird will 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 15 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 people in 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 the highest risk of severe disease.
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 include:
Public health officials believe that a hot summer could increase mosquito activity and the risk of disease from West Nile virus.
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.
of Public Health
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Springfield, Illinois 62761
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