Multiple U.S. Counties Intensify Mosquito Spraying Against West Nile Virus

Across multiple U.S. regions, health officials are ramping up mosquito control efforts in response to detections of West Nile Virus (WNV) in mosquito populations. Dallas, Pitt County (North Carolina), Orange County (California), York County (Pennsylvania), and Shelby County (Tennessee) have all scheduled insecticide spraying operations targeting mosquitoes, primarily during nighttime hours to minimize human exposure. The sprays use EPA-approved products that break down quickly, with officials advising residents to stay indoors, keep windows closed, and remain in vehicles with windows up when near spraying trucks. In addition to aerial adulticide treatments, some counties like Shelby are also applying larvicides to water sources to reduce mosquito breeding. Residents are urged to take personal protective measures such as wearing long sleeves and pants, using insect repellents containing DEET or other effective ingredients, and eliminating standing water around their homes to reduce mosquito habitats. These coordinated responses aim to prevent the spread of WNV, which is transmitted through mosquitoes that acquire the virus from infected birds, with no human cases currently reported in some areas like Orange County.