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Balantidium coli, image, image, image, image, image, image, image, image,…
Balantidium coli
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Clinical features
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In chronic balantidiasis, patients have diarrhea alternating with constipation.
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Pathogenesis
In a healthy individual, B. coli lives as lumen commensal and it is asymptomatic.
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malnourishment, alcoholism, achlorhydria etc
Unlike E. histolytica, B. coli does not invade liver or any other extra intestinal sites.
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Laboratory Diagnosis
cultured in vitro in Locke's egg albumin medium or NIH polyxenic medium such as Entamoeba histolytica
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Morphology
Trophozoites
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It is a large ovoid cell, about 60- 70 μmin length and 40- 50 μm in breadth.
Cysts
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Cytoplasm is granular. Macronucleus, micronucleus
and vacuoles are also present in the cyst.
History
lt was first described by Malmsten in 1857, in the feces of dysebtric patients.
Distribution
E. coli resides in the large lntestine of man, pigs and monkeys
The most endemic area is New Guinea, because of close association of human and pigs.
It is present worldwide, but the prevalence of the infection is less.
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