Reported Cases of Human Anaplasmosis in Minnesota by Year
From 1995 to 2010, 2,638 cases of human anaplasmosis (HA) (formerly known as human granulocyctic ehrlichiosis) were reported in Minnesota. A record number of 720cases were reported in 2010 (16.9 cases per 100,000 population). The median number of 322 cases (range 139-322) reported from 2004 to 2010 is also considerably higher than the median number of cases reported annually from 1996 to 2003 (median 56, range 14-149).
The number of anaplasmosis cases has been increasing since the first cases of HA were reported in Minnesota in the mid-1990s. A variety of factors, including increasing physician awareness, increasing infection rates in ticks, and expanding tick distribution, may have led to this trend.
The HA cases in 2010 ranged in age from 2 to 92 years; the median age (57 years) was greater than that of Lyme disease (39 years). In 2010, 59% of HA cases were male.
- Reported Cases of Human Anaplasmosis in Minnesota
by Year, 1995-2008 (PDF: 32KB/1 page)
Graph showing the number of reported cases of human anaplasmosis in Minnesota by year.