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.
Spotlight
Blacklegged tick (deer tick) life stages next to a metric ruler. The adult ticks (two ticks at the left) are approximately 1/8 of an inch long, while the nymph (third from left) is just under 1/16 of an inch.
June 29, 2011: Tick-borne Disease Health Alert
Minnesota Records First Death from Tick-Borne Powassan Virus
May 6, 2011: Tick-borne Disease Health Alert
Anaplasmosis Rivals Lyme Disease As Record Numbers of Minnesotans Sick from Tick-Borne Diseases in 2010.
Special Review Panel Unaimously Upholds Lyme Disease Treatment Guidelines: Short-term Antibiotics Proven to be Best Treatment for Patients
4/2010 Update: Special review panel unanimously upholds Lyme disease treatment guidelines. Infectious Diseases Society of America (IDSA)
High Risk Areas in Minnesota
A map that shows counties of highest Tick-borne risk in Minnesota.
Ticks
Learn about blacklegged ticks (deer ticks) including their life cycle, feeding habits, habitat, and population control. Also includes information on American dog ticks, the vector of Rocky Mountain spotted fever in Minnesota.
Preventing Tick-Transmitted Disease
Information about minimizing your risk of tick-transmitted diseases, protecting your pets, and removing ticks.
Tickborne Prevention Poster: Spray Before You Work or Play
If you have questions or comments about this page, use our IDEPC Comment Form or call 651-201-5414 (TTY: 651-201-5797) for the MDH Infectious Disease Epidemiology, Prevention and Control Division.
