Lyme Disease Statistics

In 2014, 896 confirmed Lyme disease cases (16.5 cases per 100,000 population) were reported. In addition, 520 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.  Despite some yearly fluctuations, the number of reported cases of Lyme disease has been increasing, as evidenced by the median number of cases from 2006 through 2014 (median, 1,065; range, 896 to 1,431) compared to the median from 1996 to 2005 (median, 464; range, 252 to1,023). In 2014, the median age of confirmed Lyme disease cases was 39 years (range, <1 to 88 years) and 62% of cases were male.Of the 824 cases with known onset dates, onset of symptoms peaked from June through August, with 40% of EM cases experiencing symptom onset in July. This timing corresponds with peak activity of blacklegged tick (deer tick) nymphs in mid-May through mid-July. This lag is due to the 3-30 day period between an infected tick bite and the start of signs and symptoms. The majority of cases in 2014 either resided in or traveled to endemic counties in north-central, east-central, or southeast Minnesota, or Wisconsin.

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.

On this page:
Charts and graphs
Maps
Annual summaries
National statistics

  • Interactive Lyme disease data
    Interactive facts and figures available through MN Public Health Data Access. Includes reported cases of Lyme disease in Minnesota by year, month, age, sex, and symptom as well as a map of Lyme disease cases over time.

Charts and graphs

Maps

In recent years, most Lyme disease cases reported likely exposure to blacklegged (deer) ticks in east-central, north-central, and southeast Minnesota.

Annual summaries

National statistics

 

 

Updated Wednesday, August 05, 2015 at 03:30PM