The Michigan Department of Health and Human Services Bureau of Laborotories has reported the detection of the first mosquito-borne virus of 2023 in Saginaw County. Mosquitos collected in Saginaw County have tested positive for Jamestown Canyon virus (JCV). Residents across Michigan are being urged to protect themselves against JCV and other mosquito-borne illnesses, including eastern equine encephalitis (EEE) and West Nile virus (WNV). The best form of protection against mosquito-borne illnesses is to prevent mosquito bites.
The JCV virus is spread to people through bites from infected mosquitos. Most cases occur from late spring through mid-fall. Illness can develop within a few days to two weeks following a bite from an infected mosquito. While most people do not become ill, initial symptoms can include fever, headache and fatigue. In rare cases, it can cause severe disease in the brain and/or spinal cord including encephalitis and meningitis. Infected mosquitos spread the virus to other animals or people through bites. Arboviruses, including WNV and EEE, spread when mosquitos contract the virus from biting infected birds then biting a human.
Residents can stay healthy by using simple, effective strategies to protect themselves and their families. The following steps are recommended to avoid mosquito-borne diseases:
Apply insect repellents that contain the active ingredient DEET or other EPA-approved products to exposed skin or clothing. Always follow the manufacturer’s directions for use.
Wear light-colored, long-sleeved shirts and long pants when outdoors. Apply insect repellent to clothing to help prevent bites.
Maintain window and door screening (in good repair) to help keep mosquitos outside.
Empty water from mosquito breeding sites around the home, such as buckets, unused kiddie pools, old tires and other water-holding containers where mosquitos can lay eggs. Use MDARD’s list of licensed pesticide applicator businesses in Michigan to find qualified mosquito abatement applicators in your area. For more information about mosquito-borne diseases, visit
Michigan.gov/EmergingDiseases
