Giardiasis is one of the leading waterborne diseases. It typically peaks in late summer or early fall. In 2011, there were 271 cases in Iowa. Diapered children and those in child care are most likely to become infected with giardia. Twenty-one percent of cases were age five and under. There were 8.9 cases for every 100,000 Iowans compared to 9.4 per 100,000 in the previous year.
For more detailed information and statistics on all notifiable diseases, please see our current annual report.