Babesiosis is caused by microscopic parasites that infect red blood cells and are spread by certain ticks. In the United States, tickborne transmission is most common in particular regions and seasons: it mainly occurs in parts of the Northeast and upper Midwest and usually peaks during the warm months.
Although many people who are infected with Babesia do not have symptoms, for those who do effective treatment is available. Babesiosis is preventable, if simple steps are taken to reduce exposure to ticks.
Image: Ixodes scapularis nymph on the face of a penny. Ticks in this stage are usually the size of a poppy seed and can transmit Babesia microti if infected. Credit: Graham Hickling, University of Tennessee
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- Epidemiology & Risk Factors Who gets it and how...
- Biology Stages of parasite development...
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CDC is responsible for the collection and dissemination of national babesiosis surveillance data. Surveillance is the ongoing collection and analysis of data and the timely dissemination of information to those who need to know so that action can be taken. State and territorial health departments notify CDC of cases of nationally notifiable conditions.
CDC's Morbidity and Mortality Weekly Report (MMWR) publishes weekly counts of nationally notifiable disease data, periodic surveillance reports for selected diseases and conditions, and an annual summary of nationally notifiable conditions.
Although babesiosis is nationally notifiable, it may not be a reportable condition in every state. Health care professionals should consult their local, territorial, or state health departments about which conditions should be reported to the health department.
Regardless of whether babesiosis is reportable in a particular state, it is important for the public and clinicians to inform their health department about potential cases so that appropriate responses can be taken.
Babesiosis Case Report Form
For cases of babesiosis that have been identified and reported through the National Notifiable Diseases Surveillance System, states are also encouraged to submit additional information using OMB-approved CDC Case Report Forms (CRFs). The Babesiosis CRF [PDF, 2 pages, 650 KB] includes variables that routine electronic reporting does not, such as risk factors for infection, clinical manifestations, and laboratory results. If a state-specific form is already used to collect such information, the supplemental details may be submitted to CDC in lieu of a CRF.
For more information regarding babesiosis surveillance or assistance in completing the form, please call the Parasitic Diseases Branch at 404-718-4745 or email parasites@cdc.gov. Completed forms (or other supplemental information) may be submitted to CDC in any of the following ways:
Print and mail to:
CDC, Parasitic Diseases Branch
Attn: Babesiosis Surveillance
1600 Clifton Road NE
Mailstop A06
Atlanta, GA 30333
Fax to:
CDC, Parasitic Diseases Branch
Attn: Babesiosis Surveillance
404-718-4816
Related Links
- Babesiosis - 2011 Case Definition
- Babesiosis Case Report Form
[PDF, 2 pages, 650 KB]
- List of Nationally Notifiable Conditions, June 2010
- Council of State and Territorial Epidemiologists
Blood transfusion-associated cases of babesiosis in the United States have also been documented over the past 3 decades.
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