Reported Cases of Lyme Disease in Minnesota by Year

From 1996 to 2012, over 17,000 cases of tick-borne diseases were reported in Minnesota, the majority of which (12,935 cases) were Lyme disease. In 2012, 912 confirmed Lyme disease cases (17.2 cases per 100,000 population) were reported. In addition, 604 probable cases (physician-diagnosed cases that did not meet clinical evidence criteria for a confirmed case but that had laboratory evidence of infection) were reported.  The median number of 1,050 cases (range 911-1,293 cases) reported from 2004 through 2012 is considerably higher than the median number of cases reported annually from 1996 through 2003 (median 373 cases, range 252-866).

The number of Lyme disease cases has been increasing dramatically since the 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 Lyme disease cases in 2012 ranged in age from 1 to 92 years; the median age was 39 years. In 2012, 63% of Lyme disease cases were male.

graph of reported cases of lyme disease in Minnesota

Updated Tuesday, 25-Jun-2013 07:42:45 CDT