Mosquitoes in a Butler County community have tested positive for West Nile virus. The Mercer County Conservation District says the mosquitoes collected in Franklin Township were the first sample to test positive for the virus in Butler County in 2025.

West Nile virus has been detected in mosquitoes in New York City, but no human cases have been reported in the city so far in 2025.

Bucks County Health Department plans to spray insecticide to reduce mosquito populations and West Nile virus risk.