Salt Lake County reported the year's first case as more mosquitoes statewide are testing positive for the infection.

The Salt Lake County Health Department is warning residents to protect themselves against mosquito bites after confirming the first human case of the West Nile virus in 2025. The big picture: The adult was likely infected "with a more severe form of the disease" in late July,

The risk for West Nile virus is high in 10 cities and towns in Massachusetts, including Boston, public health officials say.