Giardiasis is the human infection caused by the flagellated protozoan Giardia lamblia. This organism is distributed worldwide among most cultural groups. Once colonized in humans, its clinical expression may vary from no symptoms to those of steatorrhea and malnutrition. Its cosmopolitan distribution adds this parasite to the list of parasitic burdens already existing in many developing countries. In this setting, the protozoan is often present simultaneously with other parasites or infectious agents. In developed nations, giardiasis has become an important problem, particularly among certain subsets of the population or during epidemic outbreaks. The common thread that maintains this parasite as an active pathogen is fecal contamination. Fecal contamination with the cysts of G. lamblia is needed for its transmission to a new host. It is this factor that must be considered in the treatment, prevention, and control of giardiasis.


Digital Rectal Examination Fecal Contamination Fecal Specimen Public Water Supply Epidemic Outbreak 
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