La Crosse encephalitis

noun

lə-ˈkrȯs- 

: an encephalitis typically affecting children that is caused by the La Crosse virus transmitted especially by a mosquito of the genus Aedes (A. triseriatus)

La Crosse encephalitis, named for the Wisconsin city where it was discovered in the 1960's in a child who died, now occurs widely across the country. It is spread by a late-afternoon biter, Aedes triseriatus, a woodland dweller that breeds in water-filled tree holes and old tires.

—Jane E. Brody, The New York Times