National case definition: Giardiasis

Date of last revision/review: May 2008

National notification

Only confirmed cases of disease should be notified.

Type of surveillance

Routine case-by-case notification to the federal level

Case classification

Confirmed case

Laboratory confirmation of infection with or without symptoms from stool, duodenal fluid or small bowel biopsy specimen:


Probable case

Clinical illness in a person who is epidemiologically linked to a confirmed case

Laboratory comments

Clinical evidence

Clinical illness is characterized by diarrhea, abdominal cramps, bloating, weight loss, fatigue or malabsorption.

ICD code(s)

ICD-10 code(s)

ICD-9/ICD-9CM code(s)


Probable case definitions are provided as guidelines to assist with case finding and public health management, and are not for national notification purposes.

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