Michigan residents are being advised to take precautions against mosquito bites following the detection of Jamestown Canyon virus (JCV) in mosquitos collected in Saginaw County on Wednesday, May 22. These are the first infected mosquitos identified in 2024, according to the Michigan Department of Health and Human Services Bureau of Laboratories (MDHHS BOL).
Dr. Natasha Bagdasarian, chief medical executive, emphasized the importance of prevention: “It only takes one bite from an infected mosquito to cause severe illness. We urge Michiganders to use EPA-registered insect repellent, avoid areas with high mosquito activity, and wear clothing that covers arms and legs to prevent bites.”
With summer approaching, the risk of mosquito-borne illnesses such as JCV, Eastern Equine Encephalitis (EEE), and West Nile virus (WNV) increases. This year’s warm, wet spring has led to an abundance of mosquitos, particularly in woodland areas. JCV cases have been reported in Michigan in recent years, with six cases in 2021, one in 2022, and four in 2023. Additionally, 21 cases of WNV were reported last year.
JCV is transmitted to humans through bites from infected mosquitos, with symptoms ranging from fever, headache, and fatigue to severe neurological diseases like encephalitis and meningitis. Most cases occur from late spring through mid-fall.
To protect against mosquito-borne diseases, residents should:
- Use insect repellents containing DEET or other EPA-approved products.
- Wear light-colored, long-sleeved shirts and long pants outdoors.
- Ensure window and door screens are intact to keep mosquitos out.
- Eliminate standing water around the home to reduce mosquito breeding sites.
For more information, visit Michigan.gov/EmergingDiseases.
