 "The trophozoites reside in the lumen of
the large intestine of humans and animals, where
they replicate by binary fission with occasional
conjugation. - Cysts
are formed and passed with feces.
- The
cyst is the infectious stage and is acquired by
the host through ingestion of contaminated food
or water.
- Following
ingestion, excystation occurs in the small
intestine, and the trophozoites colonize the
large intestine"
- courtesy of the Division of
Parasitic Diseases at the National Center for
Infectious Diseases, Centers for Disease Control
& Prevention
- http://www.dpd.cdc.gov/DPDx/HTML/Balantidiasis.htm
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