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.
- 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
- Reported Cases of Lyme Disease in Minnesota
by Year, 1996-2013 (PDF: 108KB/1 page)
Graph showing the number of reported cases of Lyme disease in Minnesota by year.
- Reported Cases of Lyme Disease in Minnesota by Month of Onset 2000-2013 (PDF: 289KB/1 page)
This bar graph shows reported cases of Lyme disease by the month of onset.
In recent years, most Lyme disease cases reported likely exposure to blacklegged (deer) ticks in east-central, north-central, and southeast Minnesota.
- High Risk Areas for Tick-borne Diseases in Minnesota
A map that shows counties of highest tick-borne disease risk in Minnesota.
- Lyme Disease, 2014
Minnesota Department of Health, Disease Control Newsletter;
Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2014.
- Lyme Disease Statistics
Maps, charts, tables, and reports from the CDC.