Local health officials say Chicago has reached a “high risk” level of the West Nile virus because mosquitoes are testing positive earlier and could lead to a longer lasting, heightened risk this

We are now in the peak time for transmission of mosquito-borne disease to people and it is important for people to know that so they can take steps to protect themselves.” The post The risk for West Nile virus is now high in 10 Mass.

Chicago public health officials on Tuesday confirmed the city's first three human cases of West Nile virus in 2025.