West Nile virus

"Blue Jay" By Flickr User Robert Engberg / (CC X 2.0)

Illinois’ Department of Public Health announced its first positive test of a bird for West Nile virus in the state this year.


The Blue Jay was collected south of Champaign in Arcola Township last May.

Zika virus and West Nile are both transmitted by mosquitoes.

Common symptoms of West Nile virus include fever, nausea, headache and muscle aches. Symptoms can last from a few days to a few weeks.

However, four out of five people infected with the virus will not show any symptoms.

West Nile Virus Detected In DeKalb County

Jul 17, 2015
CDC / http://www.cdc.gov/Features/stopmosquitoes/index.html

Health officials in DeKalb County detected the first mosquitoes with West Nile Virus this summer.

Municipalities say they monitor catch basins that help eliminate mosquitoes, but recent heavy rains may have flushed out mosquito larvae.

Several other counties in the state already reported cases of West Nile Virus in mosquitoes this year. But there has yet to be a human case so far.

The mosquitoes get the virus from feeding on dead birds. The Health Department is collecting dead birds to be sent to the state lab for testing.

A dead bird found in Winnebago County has tested positive for West Nile Virus, which is much earlier than last year when the first positive bird in the county was found on September 2, according to a news release from the Winnebago County Health Department.

Warmer temperatures can increase the rate of Culex mosquito production, flight activity and virus replication, which results in an increased number of WNV infected mosquitos.

James Gathany / CDC

Two elderly women in northern Illinois have died after contracting West Nile virus.

The Kane County Health Department has confirmed the first human case of West Nile virus in the county this year.

U.S. Geological Survey

West Nile virus continues to be a threat in northern Illinois.

The temperature may be cooling off, but you'll still want to keep an eye on those mosquitoes. Winnebago County officials confirmed this week that a bird tested positive for West Nile virus. It's the 13th year in a row the virus has been confirmed in the county. The infected bird was found much later than last year.

Map: Bird Cases Of West Nile Virus

The Boone County Department of Public Health today confirmed that a Belvidere man is the first human case of West Nile Virus (WNV) in the county in 2014.


Illinois' first human case of West Nile virus this year is in McHenry County. Health officials say a woman in her 50s got sick earlier this month. The state had nearly 300 human cases last year and a dozen people died. To date, birds and mosquitos that tested positive for West Nile virus have been reported in 50 counties.


Two crows in Winnebago County have tested positive for the West Nile Virus. The Winnebago County Health Department also found three mosquito pools that tested positive. So far this year, there have not been any human cases reported in the county. Last year, there were three human cases in Winnebago County. In 2012, county health officials confirmed 30 birds tested positive and 13 mosquito pools.

The first case of West Nile virus in DeKalb County has been reported to the county health department.  A 59-year-old male county resident was diagnosed recently, a department spokesperson said.

“This is not unexpected,” said Jane Lux, Public Health Administrator at the DeKalb County Health Department, “due to the fact that there have been cases diagnosed throughout Illinois and the United States, and we know that mosquitoes in our area are infected.”