In the last decade, health officials have fielded reports of 2,000 cases annually on average, including 1,200 ...

CDC data shows West Nile virus around the United States is 40% higher than normal this year, with cases in the triple digits ...

Like the much more prevalent West Nile virus, the St. Louis encephalitis virus is transmitted by infected Culex mosquitoes.

St. Louis encephalitis virus found in mosquito pool in Larimer County, Colorado, with no human cases reported.

As the summer winds down, health officials are urging additional caution after an apparent rise in West Nile virus cases in ...