Ehrlichiosis is caused by several species of Ehrlichia bacteria.
The number of reported cases has been increasing in the state. In 2018, Wisconsin had 79 probable and confirmed cases of ehrlichiosis (E. chaffeensis, E. muris eauclairensis, and E. ewingii).
Below are the statewide data for ehrlichiosis.
For information on national data, visit the Centers for Disease Control and Prevention (CDC) Statistics and Epidemiology page for ehrlichiosis.
Historical ehrlichiosis surveillance included human granulocytic ehrlichiosis (HGE) and human monocytic ehrlichiosis (HME). As of 2008, the surveillance case definition changed to classify the disease by two different bacterial infections, Anaplasma phagocytophilum and Ehrlichia species.
Ehrlichiosis Cases in Wisconsin
There are three species of Ehrlichia that cause illness in the U.S. and Wisconsin: E. chaffeensis, E. muris eauclairensis, and E. ewingii.
E. muris eauclairensis
E. muris eauclairensis is a newer species of Ehrlichia. It was discovered in Wisconsin and Minnesota in 2009.
E. ewingii is rare in Wisconsin. There have been two reported cases in the state.
Ehrlichiosis Cases Reported by Month and Age
Month of Illness Onset
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