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The virus is transmitted by the same type of mosquito as West Nile virus and shares similar symptoms.

There is no vaccine or specific treatment for St. Louis encephalitis, which can be fatal in rare instances.

A rare but potentially deadly encephalitis virus has been detected in a mosquito pool for the first time in Larimer County.

The St. Louis encephalitis virus was recently discovered in a single mosquito pool in northeast Fort Collins, according to a Larimer County Department of Health and Environment news release Sept. 15. The Centers for Disease Control and Prevention data shows no human cases in Colorado since at least 2003, though all states surrounding Colorado have reported human cases since 2003.

As of Sept. 9, the CDC reported no human cases of the vir

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