In 2018, 496 confirmed or probable cases of anaplasmosis (8.9 cases per 100,000 population) were reported in Minnesota, down from the 638 cases reported in 2017.
- 307 cases (62%) were male.
- Median age of cases was 61 years (range, 2 to 92 years), 17 years older than the median age of confirmed Lyme disease cases.
- 72% of cases reported illness onsets in June and July.
- 132 (27%) cases were hospitalized at some point for their infection with a median duration of 4 days hospitalization (range, 2 to 33 days).
Despite some annual fluctuations in reported cases, the overall trend is an increase in yearly case totals over time with a median of 627 cases reported per year since 2010.
Charts and Graphs
- Reported Cases of Anaplasmosis in Minnesota
by Year, 1996-2018 (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.