West Nile Virus Found in Multiple US, Canadian Counties

Multiple counties across Michigan, Indiana, Pennsylvania, and Ontario have detected West Nile Virus in mosquito populations this year, with Michigan confirming its first human case. Health officials emphasize that while many infected individuals show no or mild symptoms, a small percentage, particularly adults over 49 or those with weakened immune systems, can develop severe and potentially fatal illness involving the central nervous system. Prevention advice from health departments includes using EPA-approved insect repellents containing DEET or similar ingredients, wearing long-sleeved clothing, removing standing water to eliminate mosquito breeding grounds, and avoiding outdoor exposure during peak mosquito activity at dawn and dusk. No specific treatment or vaccine exists for West Nile Virus, so symptom relief focuses on rest, fluids, and pain management. Public health authorities continue to monitor mosquito populations through routine surveillance programs and urge residents to remain vigilant in protecting themselves from mosquito bites to reduce transmission risk. Updated local data on human cases and mosquito activity are regularly available through health department websites.