In 2021, 603 confirmed or probable cases of anaplasmosis (10.5 cases per 100,000 population) were reported in Minnesota, up from the 407 cases reported in 2019.
- 382 cases (63%) were male.
- Median age of cases was 64 years (range, 1 to 96 years), 19 years older than the median age of confirmed Lyme disease cases.
- 66% of cases reported illness onsets in May, June, or July.
- 173 (29%) cases were hospitalized at some point for their infection with a median duration of 4 days hospitalization (range, 1 to 44 days).
Charts and Graphs
- Reported Cases of Anaplasmosis in Minnesota by Year, 1996-2021 (PDF)
Graph showing the number of reported cases of anaplasmosis in Minnesota by year.
Most anaplasmosis cases report likely exposure to blacklegged ticks in the same east-central and north-central Minnesota counties where the risk of Lyme disease is greatest.
- High Risk Areas for Tickborne Diseases in Minnesota
A map that shows counties of highest tickborne disease risk in Minnesota.
Annual Summary Statistics
- Anaplasmosis, 2019
Minnesota Department of Health, Disease Control Newsletter
- Anaplasmosis Statistics
Maps, charts, tables, and reports from the CDC.