Eastern Equine Encephalitis: Wisconsin Data

The first human case of Eastern equine encephalitis (EEE) in Wisconsin was identified in 1964.

EEE is very rare in Wisconsin, but can lead to severe illness or even death. There have been five reported human cases of EEE in Wisconsin from 1964 to 2020.

Two of those cases occurred in 2020.

Below are the statewide data for EEE.

Counties with reported cases of EEE in horses or in humans indicate that some mosquitoes in the area are infected with the virus and may spread EEE to other humans or animals.

For information on national data, visit the Centers for Disease Control (CDC) Epidemiology and Geographic Distribution page for Eastern Equine Encephalitis.

Eastern Equine Encephalitis Virus Case Data

2021 Wisconsin EEE Case Data
Updated October 25, 2021

Human confirmed 0
Human probable* 0
Deaths** 0
Hospitalizations 0
Equine (horse) 10
Counties reporting EEE activity 10

* Probable cases have presumptive positive laboratory results without confirmatory testing at CDC.
** The deaths are included among the confirmed and probable cases.

EEE Activity 2021

Human Eastern Equine Encephalitis Data (2011-2020)

Eastern Equine Encephalitis virus cases in Wisconsin 2011-2020

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Last Revised: October 25, 2021