The Knox County Health Department reported reported 2025’s first two cases of La Crosse, a virus spread by mosquitos last month. So far in 2025, the CDC is reporting 10 cases across the U.S. Nearly a third of those are in Tennessee, which also has the most cases of all the states listed.

Through its mosquito surveillance program, Franklin County Public Health is seeing its highest level of West Nile virus in years. “This has been a very, very active