GIARDIASIS
(Giardia lamblia)

Clinical Criteria
Any person with at least one of the following four:
– Diarrhoea
– Abdominal pain
– Bloating
– Signs of malabsorption (e.g. steatorrhoea, weight loss)

Laboratory Criteria
At least one of the following two:
– Demonstration of Giardia lamblia cysts or trophozoites in stool, duodenal fluid or smallbowel
biopsy
– Demonstration of Giardia lamblia antigen in stool

Epidemiological Criteria
At least one of the following four epidemiological links:
– Exposure to contaminated food / drinking water
– Human to human transmission
– Exposure to a common source
– Environmental exposure

Case Classification
A. Possible case NA
B. Probable case
Any person meeting the clinical criteria and with an epidemiological link
C. Confirmed case
Any person meeting the clinical and the laboratory criteria