First Mosquitoes in Illinois with West Nile Virus Test Positive in Wayne, Illinois in DuPage County

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Inland Floodwater (Aedes vexans) or Asian Tiger Mosquito (Aedes albopictus) on Broccoli
Inland Floodwater (Aedes vexans) or Asian Tiger Mosquito (Aedes albopictus) on Broccoli.

First 2019 Mosquito Batch with West Nile Virus in Wayne

The Illinois Department of Public Health (IDPH) has confirmed the first mosquitoes to test positive for West Nile virus (WNV) in Illinois for 2019. DuPage County Health Department staff collected the positive mosquitoes on May 21, 2019 in Wayne, Illinois. No human cases of West Nile virus have been reported so far in 2019.

In 2018, the first mosquitoes to test positive for West Nile virus in 2018 were collected on May 25, 2018 in Glenview and Morton Grove in Cook County by the North Shore Mosquito Abatement District. Last year, 74 counties in Illinois reported a West Nile virus positive mosquito batch, bird and/or human case. IDPH reported 176 human cases (although human cases are underreported), including 17 deaths.

“The recent rains are leaving many pools of water behind, not only in sewer systems under streets and drainage ditches along roads, but in our own backyards,” said Acting IDPH Director Dr. Ngozi Ezike. “As we start to see higher temperatures, we will start to see more West Nile virus activity. While we see West Nile virus in Illinois every year, it is important not to become complacent. It’s easy to take precautions to protect yourself by wearing insect repellent and getting rid of standing water around your home.”

Monitoring for West Nile virus in Illinois includes laboratory tests for mosquito batches, dead crows, blue jays, robins and other perching birds, as well as testing sick horses and humans with West Nile virus-like symptoms. People who see 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 Culex pipiens mosquito, commonly called a house mosquito, that has picked up the virus by feeding on an infected bird. Common symptoms include fever, nausea, headache and muscle aches. Symptoms may last from a few days to a few weeks. However, four out of five people infected with West Nile virus will not show any symptoms. In rare cases, severe illness including meningitis, encephalitis, or even death, can occur. People older than 60 and individuals with weakened immune systems are at higher risk for severe illness from West Nile virus.

The illness that is caused by WNV is known as West Nile fever. Common symptoms of West Niles Virus (WNV) infection include fever, nausea, vomiting, headache and muscle aches. Some or all of these symptoms affect about 20 percent of people infected, and may last from a few days to a few weeks. However, about 80 percent of people infected with West Nile virus do not have any symptoms, and is a big part of the reason that WNV is under-reported.

The severe illness that is caused by WNV is known as West Nile neuroinvasive disease (WNND). Severe illnesses related to WNV infection include meningitis (WNM), encephalitis (WNE), West Nile meningoencephalitis (inflammation of both the brain and meninges), and West Nile poliomyelitis (WNP). Least common is WNP, which is characterized by the acute onset of asymmetric limb weakness or paralysis in the absence of sensory loss. Pain sometimes precedes the paralysis, which can occur in the absence of fever, headache, or other common symptoms associated with WNV infection. Involvement of respiratory muscles, leading to acute respiratory failure is possible.

The severe forms often require life support in an Intensive Care Unit (ICU). There is no specific cure for the severe illnesses, but life support with oxygen, mechanical respiration support and nutrition are required while patients are in a near coma state. Although rare, severe WNV infections can cause unstable gait, high fever with rapid breathing, low oxygen levels, respiratory arrest, severe tremors, brain damage and death.

WNV is transmitted through mosquito bites.

Precautions to Fight the Bite include practicing the three “R’s” – reduce, repel, and report

REDUCE – 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.
Eliminate, or refresh each week, all sources of standing water where mosquitoes can breed, including water in bird baths, ponds, flowerpots, wading pools, old tires, and any other containers.

REPEL – when outdoors, wear shoes and socks, long pants and a light-colored, long-sleeved shirt, and apply insect repellent that contains DEET, picaridin, oil of lemon eucalyptus, or IR 3535 according to label instructions. Consult a physician before using repellents on infants.

REPORT – report locations where you see water sitting stagnant for more than a week such as roadside ditches, flooded yards, and similar locations that may produce mosquitoes. The local health department or city government may be able to add larvicide to the water, which will kill any mosquito eggs.







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CARDINAL NEWS | First Batch of 2018 West Nile Virus Mosquitoes Found in Glenview and Morton Grove Friday May 25

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Inland Floodwater (Aedes vexans) or Asian Tiger Mosquito (Aedes albopictus) on BroccoliInland Floodwater (Aedes vexans) or Asian Tiger Mosquito (Aedes albopictus) on Broccoli leaf.

West Nile virus is primarily transmitted by mosquitoes, mostly species of the genus Culex, but mosquitoes and ticks have also been found to carry the virus. Aedes albopictus bite diverse host species enabling the Asian tiger mosquito to be a potential bridge vector for certain pathogens such as West Nile virus.

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