Division Laboratory Criteria
United Kingdom
At least one of the following three:
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Demonstration of Giardia lamblia cysts or trophozoites in stool, duodenal fluid or small-bowel biopsy
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Demonstration of Giardia lamblia antigen in stool, duodenal fluid or small-bowel biopsy
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Detection of Giardia lamblia nucleic acid in stool, duodenal fluid or small-bowel biopsy