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Ehrlichiosis is an illness spread by ticks. There are several types of bacteria that cause ehrlichiosis in Wisconsin. Ticks that can spread these bacteria are found in every county in Wisconsin.

Not all tick bites will make you sick, but it’s important to take steps to protect yourself and your family while enjoying time outdoors.

Ehrlichiosis 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).

About Ehrlichiosis

Learn more about ehrlichiosis, including signs and symptoms, treatment, and resources.


Map and charts with ehrlichiosis data.


Reporting and surveillance

Local or Tribal health departments and health care providers can learn about disease reporting, testing, treatment, and more.

Tick Bite Prevention

Tips to prevent tick bites.

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 April 10, 2023