Anaplasmosis Statistics

In 2022, 540 confirmed and probable cases of anaplasmosis were reported in Minnesota. The majority of cases with a known onset date reported illness onsets in May, June, or July. This timing is consistent with exposures occurring during the typical peak season for blacklegged tick activity in Minnesota.

• 341 cases (63%) were male
• Median age of cases was 65 years (range, 3 to 93 years), 13 years older than the median age of Lyme disease cases
• 163 (30%) cases were hospitalized at some point for their infection with a median duration of 4 days (range, 2 to 55 days)
   

Charts and Graphs

• Reported Cases of Anaplasmosis in Minnesota by Year, 1996-2022 (PDF)
  Graph showing the number of reported cases of anaplasmosis in Minnesota by year.

Maps

Most anaplasmosis cases report likely exposure to blacklegged ticks in the same east-central, north-central, and southeast 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: Annual Summary of Reportable Diseases
  The Minnesota Department of Health collects information on infectious diseases for the purposes of determining disease impact, assessing trends in disease occurrence, characterizing affected populations, prioritizing control efforts, and evaluating prevention strategies, and reports statistics annually. Note: There are no listings for years in which there were no cases reported. The annual summary archives available on the web go back to 1997.

National Statistics

• CDC: Anaplasmosis Statistics 
  Maps, charts, tables, and reports from the CDC.