Figure 1: Estimated geographic distribution of blacklegged ticks (above) and western blacklegged ticks (below)
Anaplasmosis is a tickborne disease caused by the bacterium Anaplasma phagocytophilum.
- Tick bites
- Blood transfusion
- In rare cases, A. phagocytophilum has been spread by blood transfusion.
Anaplasmosis is most commonly reported in the Northeastern and upper Midwestern states.