Western equine encephalitis virus 

Western equine encephalitis (WEE) is an illness transmitted to people and horses through the bite of a mosquito infected with WEE virus.

WEE is normally maintained between Culex tarsalis mosquitoes (1 of 50 species in Minnesota) and birds. People and horses are bitten by Culex tarsalis during the late summer months (mid-July through early September).  (Credit: Minnesota Department of Health)

Please visit the Minnesota Department of Health page for more details.