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Anaplasmosis is an illness spread by ticks. It is the second most common illness spread by ticks in Wisconsin. It usually spreads through the bite of a deer tick infected with the bacteria that causes anaplasmosis. Ticks that spread this bacterium can be found in every county in Wisconsin.

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

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

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

About Anaplasmosis

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


Map and charts with anaplasmosis data.


Reporting and Surveillance

Local 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 11, 2023