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Anaplasmosis: Wisconsin Data

Anaplasmosis is the second most common illness spread by ticks reported in Wisconsin.

From 2016 through 2020, Wisconsin had an average of 472 probable and confirmed cases of anaplasmosis. In 2020, a total of 335 probable and confirmed cases of anaplasmosis were reported.

In 2021, a total of 773 probable and confirmed cases of anaplasmosis were reported.

Anaplasmosis is preventable and treatable. Learn more about Tick Bite Prevention.

Read about Treatment and Signs and Symptoms from the CDC (Centers for Disease Control and Prevention).

The graphs below show statewide data for anaplasmosis. For national data, visit the CDC webpage on Anaplasmosis Epidemiology and Statistics.

Map of Anaplasmosis cases by county in Wisconsin


Anaplasmosis data

In the past, ehrlichiosis surveillance included human granulocytic ehrlichiosis and human monocytic ehrlichiosis. As of 2008, the surveillance case definition changed to classify the disease by two different bacterial infections: Anaplasma phagocytophilum and Ehrlichia species.

Graph of total Anaplasmosis cases

Average Amaplasmosis cases by month

Anaplasmosis Cases by age

Learn more about anaplasmosis

Contact us

Questions about illnesses spread by ticks? We’re here to help.

Bureau of Communicable Diseases
Phone: 608-267-9003
Fax: 608-261-4976

Last revised January 9, 2023