Diseases A-Z

Giardiasis

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• Reporting
• Statistics

Giardiasis is an illness caused by Giardia lamblia, a one-celled, microscopic parasite that lives in the intestines of people and animals. During the past 15 years, Giardia lamblia has become recognized as one of the most common causes of waterborne disease in humans in the United States. This parasite is found in every region of the United States and throughout the world.

More info/links

Disease reporting

Health care providers and clinical laboratories are required by law to report cases and suspect cases of Giardiasis to local health departments within one working day of identification. Cases are subject to restriction on school and day-care attendance, food handling, and patient care for the duration of any diarrhea and/or vomiting.

Disease reporting form for health-care practitioners (PDF 42K)

For county health departments:

Investigative guidelines (PDF 61K) Case report form (PDF 40K)