West Nile Virus Found in Mosquitoes, Animals Across Multiple US States

West Nile virus has been detected in mosquitoes across multiple states in 2025, including Rockland County, New York; Massachusetts; and Richland County, Ohio, raising concerns about increased mosquito activity during the summer months. In Rockland County, the first positive mosquito pool was confirmed in the Town of Orangetown, with no human cases reported so far this season. Massachusetts has identified its first animal case this year, a goat in Lunenburg, leading to several towns being designated as moderate risk; 10 mosquito samples tested positive, though no human cases have emerged yet. Ohio officials reported West Nile virus in mosquitoes in Mansfield, emphasizing that no human infections have been confirmed, but residents are urged to take precautions such as eliminating standing water and using mosquito repellent. Health authorities across these regions stress that while most people infected by West Nile virus show no symptoms, severe illness can occur, especially in individuals over 50 or those with weakened immune systems, and recommend preventive measures to reduce mosquito bites. Surveillance and control programs remain active to monitor and manage mosquito populations to reduce the risk of transmission.