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Giardiasis (Giardia lamblia)
1997 Case Definition
CSTE Position Statement Number: 09-ID-34
Clinical description
An illness caused by the protozoan Giardia
lamblia and characterized by diarrhea, abdominal cramps,
bloating, weight loss, or malabsorption. Infected persons may
be asymptomatic.
Laboratory criteria for diagnosis
- Demonstration of G. lamblia cysts
in stool, or
- Demonstration of G. lamblia trophozoites
in stool, duodenal fluid, or small-bowel biopsy, or
- Demonstration of G. lamblia antigen
in stool by a specific immunodiagnostic test (e.g., enzyme-linked
immunosorbent assay)
Case classification
Probable: a clinically
compatible case that is epidemiologically linked to a confirmed
case
Confirmed: a case that is laboratory confirmed
Comment
The 1997 case definition appearing on this page was re-published in the 2001 CSTE position statement 2001-ID-08 and the 2009 CSTE position statement 09-ID-34. Thus, the 1997, 2002, and 2010 versions of the case definition are identical.
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