New York health officials increase mosquito surveillance amid rising West Nile virus activity

Health officials in New York are increasing surveillance and control measures following a significant rise in West Nile virus activity. In New York City, the number of West Nile-positive mosquito pools nearly doubled compared to the same period in 2024, with 612 positive pools identified out of 2,040 tested by late July. While no human infections have been reported in the city, officials are conducting mosquito-control treatments in wetlands and marshes to mitigate risk.

In Oswego County, officials are also urging residents to ‘fight the bite’ to prevent mosquito-borne illnesses such as West Nile virus and Eastern equine encephalitis virus. The county is utilizing a long-term mosquito surveillance program to monitor active areas and inform control measures.

Public health experts recommend that residents reduce exposure by using EPA-registered insect repellents containing DEET, picaridin, or oil of lemon eucalyptus. Other preventative measures include wearing long sleeves and pants, limiting outdoor activity during dusk and dawn, and eliminating standing water around homes.