From 2008 to 2017 there were 6,813 cases of giardiasis reported in Minnesota.
During 2017, 643 cases of Giardia infection (11.7 per 100,000) were reported. This represents a 4% decrease from the median number of cases reported annually from 2007 through 2016 (median, 667 cases; range, 620 to 904). Recent immigrants and refugees accounted for 28% of all cases. An additional 15% of cases reported international travel in the 3 weeks prior to illness onset. Excluding recent immigrants and refugees, the median age of cases was 39 years (range, 7 months to 95 years). Sixteen percent were <10 years of age, and 36% were >50 years of age. Sixty percent of non-immigrant and refugee cases were male. Giardia infections showed a summer/fall seasonality; 46% of non-immigrant and refugee cases occurred during July through October. Forty-two (6.5%) cases required hospitalization, for a median of 4 days (range, 1 to 56 days). Two outbreaks were identified that accounted for three laboratory-confirmed cases. One was an outbreak associated with person-to-person transmission at a child care center, and the other was an outbreak probably associated with consumption of surface water along a Lake Superior hiking trail.
Charts and graphs:
- Reported Cases of Giardiasis in Minnesota, 2007-2018 (PDF)
Bar graph showing the number of reported giardiasis cases in Minnesota.
- Giardiasis, 2016
Minnesota Department of Health Disease Control Newsletter, Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health.
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