Anaplasmosis
Anaplasmosis (formerly called human granulocytic ehrlichiosis) is caused by the bacterium Anaplasma phagocytophilum. It is spread to people through the bite of an infected Black-legged (“deer”) tick (Ixodes scapularis). Treatment is available; however if it is delayed, or there are underlying medical conditions, symptoms can become more severe. The best way to prevent anaplasmosis is to prevent tick bites.
Information for Clinicians
National Surveillance Case Definitions
Connecticut Laboratory Reporting Information
Directory of Clinical Testing Services – provided by the State Public Health Laboratory
State Public Health Laboratory Contacts – for additional information
Tick-borne Diseases of the United States – a Reference Manual for Healthcare Providers
Connecticut Anaplasmosis Surveillance
In 2008, the Centers for Disease Control and Prevention (CDC) established a surveillance case definition for anaplasmosis and the Connecticut Department of Public Health (DPH) added the disease to the list of state-wide reportable diseases. Since 2008, an average of 69 cases (range 22–120) have been reported to DPH, annually. The CDC updated the case definition in 2024.
For current anaplasmosis statistics, please visit Connecticut Annual Infectious Diseases Statistics