Skip to main content
State of Wisconsin flag

Official website of the State of Wisconsin

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.

Ehrlichiosis in Wisconsin

Ehrlichiosis is an illness spread by ticks. There are several types of bacteria that cause ehrlichiosis in Wisconsin. Ticks that spread ehrlichiosis-causing bacteria can be found in every county in Wisconsin. Not all tick bites will make you sick, but it is still important to take steps to protect yourself and your family while enjoying time outdoors. Ehrlichiosis is preventable and treatable.

General information on ehrlichiosis, including information on signs and symptoms, treatment, and resources.

Map and charts with ehrlichiosis data.


Information for local health departments, health care providers, or those looking for information on reporting, surveillance, or diagnosis of ehrlichiosis.

Tips to prevent tick bites.


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

The recommendations in this webpage were developed in accordance with Wis. Stat. ch. 252 and Wis. Admin. Code ch. DHS 145.

Last revised September 21, 2021