Multiple regions in the United States and France have reported cases of West Nile virus amid peak mosquito season. In France, the first autochthonous cases were detected in Île-de-France following earlier cases in the Var and Gironde departments. In the U.S., the Chicago Department of Public Health confirmed three human cases of West Nile virus, indicating a high risk of transmission in the city. Additionally, ten communities in Massachusetts are currently experiencing a high risk of West Nile virus infection. New York City health officials have issued warnings about the increased mosquito activity during this peak season and provided guidance to reduce mosquito breeding sites and limit exposure to mosquito bites.