Human illness due to Ehrlichia muris subspecies eauclairensis was first identified in 2009. Since then, an average of 5-6 cases have been reported in Minnesota residents each year. A small number of human illnesses due to Ehrlichia chaffeensis are reported each year in Minnesota, some of which have traveled to southern states where the disease is more common.
Most ehrlichiosis 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.
CDC: Ehrlichiosis Statistics
Maps, charts, tables, and reports from the CDC.