Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

La Crosse Encephalitis: Wisconsin Data

La Crosse encephalitis virus is rare in Wisconsin, and few cases have been reported in recent years. Historically, most cases of La Crosse encephalitis were reported from the upper Midwestern states, but recently, more cases have been reported from the mid-Atlantic and southeastern states. La Crosse encephalitis is preventable.

Below are the statewide data for La Crosse encephalitis. For information on national data, visit the Centers for Disease Control and Prevention (CDC) Epidemiology and Geographic Distribution page for La Crosse encephalitis virus.

LaCrosse Encephalitis map

La Crosse encephalitis virus data

LaCrosse Encephalitis Virus Cases Year of Onset


Month of illness onset

LaCrosse Encephalitis Virus Cases by Month

Age group

LaCrosse Encephalitis Virus Cases by Age Group

Questions about illnesses spread by mosquitoes? Contact us!
Phone: 608-267-9003 | Fax: 608-261-4976

Last revised September 21, 2022