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Diagnosis is based on detection of trophozoites in stool samples from symptomatic patients or in tissue collected during endoscopy. Cysts are less frequently encountered, and are most likely to be recovered from formed stool. Balantidium coli is passed intermittently and once outside the colon is rapidly destroyed. Thus stool specimens should ...
Balantidium coli as seen in a wet mount of a stool specimen. The organism is surrounded by cilia. Balantidium coli has two developmental stages, a trophozoite stage and a cyst stage. In trophozoites, the two nuclei are visible.
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Aug 25, 2023 · Cyst of Balantidium coli in feces. This photograph demonstrates a thick cyst wall and a large macronucleus (X820). Courtesy Armed Forces Institute of Pathology (AFIP 75-9301).
Jan 5, 2022 · The ciliate Balantioides coli (syn. Balantidium coli) is the largest human parasitic protozoa, and can infect a wide range of hosts, with swine being the main reservoir. The parasite has a direct life cycle, with a vegetative form, the trophozoite, inhabiting the host intestine, and a resting cyst that is released into the environment in faeces.
Balantidium cysts are larger (40 to 60 μm) than ameba cysts and are binucleate (macro- and micronuclei), and at times the trophic organism can be seen spinning within the cyst wall due to ciliary activity. The two organisms are found in the trophic state in diarrheic stools.
