07/28/2024
Mosquitoes in McHenry County test positive for West Nile Virus
Post Date: 07/26/2024 12:30 PM
July 26, 2024
Media Contact: McHenry County Department of Health
Nick Kubiak, Community Information Coordinator
Mosquitoes in McHenry County test positive for West Nile Virus
The McHenry County Department of Health (MCDH) has confirmed that a mosquito pool collected from Huntley, Illinois, on July 26, 2024, has tested positive for West Nile virus (WNV). This marks the first positive test for WNV in mosquitoes for the 2024 season. Earlier this year, the MCDH’s Environmental Health division reported a WNV-positive bird. No human cases of WNV have been reported in McHenry County this year.
The MCDH will continue its WNV surveillance by collecting and testing mosquito batches through the remainder of the mosquito season, which runs from May through October. It is important to remember that the risk of WNV persists until the first hard frost. Residents are urged to protect themselves from mosquito-borne illnesses when outdoors by wearing protective clothing, such as light-colored, long-sleeved shirts, socks, and pants, and by using EPA-registered insect repellents.
Culex mosquitoes, which are the primary carriers of WNV, typically breed in stagnant water with high organic content, often found in artificial containers like rimless tires, abandoned swimming pools, buckets, bird baths, and clogged gutters. The first and best defense against mosquito-borne illnesses is to eliminate potential mosquito breeding sites by emptying standing water from containers around your home and ensuring that doors and windows have tight-fitting screens.
Human WNV illness typically occurs 2-14 days after the bite of an infected Culex mosquito. Most people exposed to WNV do not develop symptoms due to the belief that past exposure to WNV results in lifelong immunity. However, about 20% of those infected experience mild febrile (fever) illness with other symptoms, such as headaches, body aches, joint pains, vomiting, or a rash. Severe symptoms are very rare and include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness, and paralysis. Individuals 60 years of age or older or those with serious underlying health conditions, such as diabetes, kidney disease, hypertension, cancer, or who have received organ transplants are at greater risk for developing severe symptoms.
There is no vaccine or treatment for WNV. Mild symptoms can be relieved with rest, fluids, and over-the-counter medications for pain and fever. Seek medical attention if you or an individual you know develops severe symptoms.
With no vaccine currently available for WNV, it is important to use other measures for protection while enjoying the outdoors. When outdoors, wear long-sleeved shirts, pants, shoes, and socks, especially during dawn and dusk when Culex mosquitoes are most active. Use EPA-registered insect repellents with one of the following active ingredients, and apply them according to label directions:
DEET (N,N-diethyl-meta-toluamide)
Picaridin (KBR 3023)
IR3535 (a biopesticide)
Oil of lemon eucalyptus (OLE)
Para-menthane-diol (PMD)
2-undecanone
Consult with a doctor before using any repellent on infants. The United States Environmental Protection Agency (EPA) has compiled a list of EPA-registered repellents; visit ‘Find the Right Repellant that is Right for You’ on the EPA website.
For more information on WNV, visit www.mcdh.info or call (815) 334-4585.
Until further notice, the Vital Records office has been relocated to our Health Administration office in Woodstock. You may call the Health Department’s main line (815.334.4510) to order certificates or you can order them online from the Health Department’s website. The certificates will be mail...