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Epidemiology and clinical presentation of giardiasis. Counterclockwise from top left: clear mountain stream (away.com); man sampling water (students.stewards.edu); St Petersburg, Russia (geraldbrimacombe.com); small intestine with organism[arrow] and small bowel barium study (medspain.com); Giardia lamblia (nlm.nih.gov); beavers upstream (jasperadventurecentre.com).
