Giardiasis Statistics

From 2016 to 2025, there were 5514 cases of giardiasis reported in Minnesota.

During 2025, 620 cases of Giardia infection (10.9 per 100,000 population) were reported. This represents a 14% increase from the median number of cases reported annually from 2015 through 2024 (median, 543 cases; range, 388 to 792). New arrivals accounted for 19% of cases. An additional 11% of cases reported international travel in the 3 weeks prior to illness onset. Excluding new arrivals, the median age of cases was 44 years (range, 4 months to 94 years). Fourteen percent of cases were <10 years of age, Fifty-eight percent of cases were male. Giardia infections had a summer/fall seasonality; 50% of cases occurred during July through October. Forty-six (7%) cases required hospitalization, for a median of 6 days (range, 2 to 144 days). One outbreak of giardiasis was identified in Minnesota, accounting for one laboratory-confirmed case. The outbreak was associated with person-to-person transmission in a childcare setting.
 

Charts and graphs:

	Reported Cases of Giardiasis in Minnesota by County, 2016-2025 (PDF) Map showing the number of reported giardiasis cases in Minnesota by county.
	Reported Cases of Giardiasis in Minnesota, 2016-2025 (PDF) Bar graph showing the number of reported giardiasis cases in Minnesota.

Annual Summary Statistics

• Giardiasis: Annual Summary of Reportable Diseases
  The Minnesota Department of Health collects information on infectious diseases for the purposes of determining disease impact, assessing trends in disease occurrence, characterizing affected populations, prioritizing control efforts, and evaluating prevention strategies, and reports statistics annually.  Note: There are no listings for years in which there were no cases reported. The annual summary archives available on the web go back to 1997.

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