Life cycle of Balantidium infection in humans.

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Life cycle of Balantidium infection in humans. Life cycle of Balantidium infection in humans. The trophozoites and cysts are shed in feces (1), and if the cysts, in particular, contaminate drinking water or food, the infection can be spread to other humans (2). Fruits and vegetables may also be contaminated by cysts and serve as a means of transmission. The bottom panel illustrates the pattern of encystment and asexual reproduction in trophic ciliates. (Reprinted from the CDC-DPDx Parasite Image Library [http://www.dpd.cdc.gov/dpdx/].)‏ Frederick L. Schuster, and Lynn Ramirez-Avila Clin. Microbiol. Rev. 2008; doi:10.1128/CMR.00021-08