In 2014, 49 confirmed and probable babesiosis cases (0.9 per 100,000 population) were reported, down from the 69 reported cases in 2013. Despite this decrease, yearly case totals since 2005 (range, 10 to 72) have been consistently higher than reported totals from 1996 to 2004 (range, 0 to 9). In 2014, 69% of the babesiosis cases reported occurred in males. The median case age was 68 years (range, 12 to 91 years), up from 66 in 2013, and older than the median ages for both anaplasmosis (59 years) and Lyme disease (39 years). Onsets of illness peaked in the summer months; 60% patients with known onset reported first experiencing symptoms in June, July, or August. Twenty-seven (55%) cases were hospitalized for their infection in 2014 for a median duration of 5 days (range, 3 to 15 days). Although severe complications like organ failure were reported in 7 cases, there were no deaths attributable to babesiosis in 2014.The number of babesiosis cases has been increasing since it first became reportable 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.
Charts and Graphs
- Reported Cases of Babesiosis in Minnesota
by Year, 1996-2013 (PDF: 104KB/1 page)
Graph showing the number of reported cases of Babesiosis in Minnesota by year.
- Reported Cases of Babesiosis in Minnesota by Month of Onset 1996-2013 (PDF: 103KB/1 page)
This bar graph shows reported cases of Babesiosis by the month of onset.
Most babesiosis cases report likely exposure to blacklegged ticks in the same east-central,north-central, and southeast Minnesota counties where the risk of Lyme disease is greatest.
- High Risk Areas for Tick-borne Diseases in Minnesota
A map that shows counties of highest tick-borne disease risk in Minnesota.
Annual Summary Statistics
- Babesiosis, 2014
Minnesota Department of Health, Disease Control Newsletter;
Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2014.
- Babesiosis Statistics
Maps, charts, tables, and reports from the CDC.