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Babesiosis is an increasingly common, sometimes severe, and occasionally fatal disease caused by a parasite that infects red blood cells. It is caused by a single-celled parasite named Babesia. The Image of a deer tickdisease can cause fever, fatigue, and anemia lasting from several days to several months. Symptoms tend to be more apparent and severe in elderly or immunocompromised persons. Infections can also occur without producing symptoms. In the USA, the disease occurs primarily in the upper Midwest and northeastern states. The vast majority of cases are acquired through the bite of an infected Ixodes scapularis tick (deer tick); however, in rare instances, the infection has been acquired through blood transfusions.

Tickborne infections home

General information

Babesiosis fact sheet - Hmong - Spanish
Prevention and control of tickborne diseases 

Information for health professionals

This is a Wisconsin disease surveillance category II disease: 
Report to the patient's local public health department electronically, through the Wisconsin Electronic Disease Surveillance System (WEDSS), by mail or fax using an Acute and Communicable Disease case report F-44151 or by other means within 72 hours upon recognition of a case.
Information on communicable disease reporting

Wisconsin case reporting and public health follow-up guidelines: Babesiosis EpiNet  
CDC Babesiosis case report (Exit DHS)   

Data and statistics

Babesiosis Morbidity Data

Additional resources

Blacklegged Ticks - Minnesota Department of Health  
Deer Tick Images - Iowa State University  
EPA Insect Repellants: Use and Effectiveness   


Wisconsin Local Health Departments - Regional offices - Tribal agencies

Jim Kazmierczak, DVM, WI State Public Health Veterinarian
Wisconsin Division of Public Health 
Bureau of Communicable Diseases
(Phone 608-266-2154)  (Fax 608-261-4976)

Last Revised: August 20, 2014