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Balantidium coli cysts in wet mounts. Both Balantidium coli trophozoites and cysts may be shed in stools. Both stages may occur in diarrheal stools, and usually only cysts are observed formed stools.
Balantidium coli has two developmental stages, a trophozoite stage and a cyst stage. In trophozoites, the two nuclei are visible. The macronucleus is long and sausage-shaped, and the spherical micronucleus is nested next to it, often hidden by the macronucleus.
Balantidium has a simple life cycle, as follows: dormant cyst to trophozoite and trophozoite to cyst. Transmission is direct, from a contaminated water or food supply to humans (Fig. (Fig.1). 1). No intermediate host, as occurs with many other parasitic species, is needed.
- Frederick L. Schuster, Lynn Ramirez-Avila
- 10.1128/CMR.00021-08
- 2008
- Clin Microbiol Rev. 2008 Oct; 21(4): 626-638.
Aug 25, 2023 · B coli exists as a trophozoite and a cyst and usually affects the large intestine, from the caecum to the rectum. The trophozoites replicate by binary fission and conjugation, and they subsist...
Balantidium coli exists in either of two developmental stages: trophozoites and cysts. [3] In the trophozoite form, they can be oblong or spherical, and are typically 30 to 150 μm in length and 25 to 120 μm in width. [4]
Oct 23, 2023 · Trophozoites undergo encystation to produce infective cysts. Some trophozoites invade the wall of the colon and multiply; some return to the lumen and disintegrate. Mature cysts are passed in the stool and can remain viable for up to two weeks in the environment .
