Balantidium Coli

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Information about Balantidium Coli

Published on February 25, 2014

Author: PakRose1


Balantidium coli is a parasitic species of ciliate protozoan responsible for the disease Balantidiasis. Balantidium coli is the largest protozoan and the only ciliate known to parasitize humans.

Balantidiosis is a zoonotic disease. It is acquired by humans via the fecal-oral route from the normal host, the pig, where it is Asymptomatic. Water is the vehicle for most cases of Balantidiosis ofBalantidiosis.

Geographical Distribution The protozoa are found worldwide Bolivia Papua New Guinea Philippines

HOST Humans are the principle host. It is also reported in Dogs It is common in monkeys and pigs.

Site of Infection Following are the site of Infection :1 ) Caecum 2 ) Large Intestine

Morphology Balantidium coli has 2 developmental stages . 1) Trophozoite stage 2) Cyst stage

Trophozoite  Oval pointed at anterior end  50-130um long  Covered in cilia  Non-infective  Reproduce by binary fission and conjugation  Micronuclei and macronuclei

Cyst  Spherical  40-60um across  Covered with thick, hard cyst wall with cilia  Infective  Non-reproductive  Macronuclei

2) Cyst stage

Trophozoite Shape Oval, pointed at anterior end Size 50-130 m long Surface Covered in cilia Infectious Not infective Reproduction By binary fission or conjugation Nuclei Macronucleus and micronucleus

Cyst Shape Spherical Size 40-60 m across Surface Covered with thick, hard cyst wall with cilia Infectious Infective Reproduction Non-reproductive Nuclei Only macronucleus

Life cycle  Life Cycle Completed in a single host Natural hosts  Pigs Accidental host  Route : Ingestion  Reproduction: asexual and sexual

Life Cycle Life cycle is as follow : The cyst is the infective stage of Balantidium coli life cycle. Once the cyst is ingested via feces-contaminated food or water, it passes through the host digestive system. There, excystation takes place in small intestine. Excystation produces a trophozoite from the cyst stage.

 The motile trophozoite then resides in the lumen of the large intestine, feeding on intestinal nutrients.  Trophozoites multiply by asexual binary fission or sexual conjugation  The trophozoite may become invasive and penetrate the mucosa of the large intestine.  Trophozoites are released with the feces, and encyst to form new cyst Cysts in the environment are then ready to infect another host.

Sign and Symptoms Acute ,even hemorrhagic Diarrhea Ulceration to gut wall Dysentery Colitis Abdominal pain

Diagnosis  Examination of patient`s stool  Biopsy  sigmoid scope is used to visually inspect the last sections of the large intestine

Treatment  Three drugs are commonly used and administered orally 1) Tetracycline 2) Metronidazole 3) Iodoquinol

(1) Tetracycline's 500 mg four times daily for 10 days (2) Metronidazole 750 mg three times daily for 5 days (3) Iodoquinol 640 mg three times daily for 20 days

Control and Prevention  Avoid ingestion of material contaminated with animal feces  Prevention and control Sanitary disposal of human and pig feces  Treatment of infected pigs  Prevention of fecal contamination of food and water


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