Balantidiasis

Author: Valda M Chijide, MD; Chief Editor: Burke A Cunha, MD more...

Updated: Nov 22, 2011

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Background
Pathophysiology
Epidemiology
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Background

Balantidiasis (also known as balantidiosis) is defined as large-intestinal infection with Balantidium coli, which is a ciliated protozoan (and the largest protozoan that infects humans). B coli is known to parasitize the colon, and pigs may be its primary reservoir.

Pathophysiology

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 on bacteria. Humans ingest infective cysts, which then migrate to the large intestine, cecum, and terminal ileum. The organisms primarily dwell in the lumen but can also penetrate the mucosa and cause ulcers. B coli produces hyaluronidase, potentially enhancing its ability to invade the mucosa.

Frequency

United States

Balantidiasis is found worldwide and has an overall estimated prevalence of 1%. Balantidiasis epidemics have occurred in psychiatric hospitals in the United States.

International

Balantidiasis tends to be more common among persons who handle pigs. The disease is reported most commonly in Latin America; Southeast Asia; and Papua, New Guinea. In 1971, a balantidiasis outbreak involving 100 people occurred in Truk following a typhoon.^[1]In France, a pork butcher with immunosuppression due to alcohol use developed occupational balantidiasis.^[2]

Mortality/Morbidity

Most cases of balantidiasis in immunocompetent individuals are asymptomatic. Mortality rates associated with acute and fulminating types of balantidiasis were as high as 30% in untreated patients prior to the introduction of antibiotics. Pneumonia has been described in patients with cancer-related immunosuppression^[3]and has not always been associated with direct contact with pigs.

Proceed to Clinical Presentation

Contributor Information and Disclosures

Author

Valda M Chijide, MD Clinical Professor, Department of Medicine, University of Saskatchewan; Consultant in Infectious Diseases, Regina, Saskatchewan, Canada

Valda M Chijide, MD is a member of the following medical societies: American College of Physicians, HIV Medicine Association of America, and Infectious Diseases Society of America

Disclosure: Nothing to disclose.

Specialty Editor Board

Jeffrey D Band, MD Professor of Medicine, Oakland University William Beaumont School of Medicine; Director, Division of Infectious Diseases and International Medicine, Corporate Epidemiologist, William Beaumont Hospital; Clinical Professor of Medicine, Wayne State University School of Medicine

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Ronald A Greenfield, MD Professor, Department of Internal Medicine, University of Oklahoma College of Medicine

Ronald A Greenfield, MD is a member of the following medical societies: American College of Physicians, American Federation for Medical Research, American Society for Microbiology, Central Society for Clinical Research, Infectious Diseases Society of America, Medical Mycology Society of the Americas, Phi Beta Kappa, Southern Society for Clinical Investigation, and Southwestern Association of Clinical Microbiology

Disclosure: Pfizer Honoraria Speaking and teaching; Gilead Honoraria Speaking and teaching; Ortho McNeil Honoraria Speaking and teaching; Abbott Honoraria Speaking and teaching; Astellas Honoraria Speaking and teaching; Cubist Honoraria Speaking and teaching; Forest Pharmaceuticals Speaking and teaching

Eleftherios Mylonakis, MD Clinical and Research Fellow, Department of Internal Medicine, Division of Infectious Diseases, Massachusetts General Hospital

Eleftherios Mylonakis, MD is a member of the following medical societies: American Association for the Advancement of Science, American College of Physicians, American Society for Microbiology, and Infectious Diseases Society of America

Disclosure: Nothing to disclose.

Chief Editor

Burke A Cunha, MD Professor of Medicine, State University of New York School of Medicine at Stony Brook; Chief, Infectious Disease Division, Winthrop-University Hospital

Burke A Cunha, MD is a member of the following medical societies: American College of Chest Physicians, American College of Physicians, and Infectious Diseases Society of America

Disclosure: Nothing to disclose.

References

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Vasilakopoulou A, Dimarongona K, Samakovli A, et al. Balantidium coli pneumonia in an immunocompromised patient. Scand J Infect Dis. 2003;35(2):144-6. [Medline].
Dodd LG. Balantidium coli infestation as a cause of acute appendicitis. J Infect Dis. Jun 1991;163(6):1392. [Medline].
Anargyrou K, Petrikkos GL, Suller MT, et al. Pulmonary Balantidium coli infection in a leukemic patient. Am J Hematol. Jul 2003;73(3):180-3. [Medline].
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Micromedex. Tetracycline. Drugdex Drug Evaluations. micromedex. Available at http://www.micromedex.com. Accessed 2000.
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Yazar S, Altuntas F, Sahin I, et al. Dysentery caused by Balantidium coli in a patient with non-Hodgkin's lymphoma from Turkey. World J Gastroenterol. Feb 1 2004;10(3):458-9. [Medline].
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Trophozoite of Balantidium coli in colon. This photograph shows the large macronucleus and the thin cell membrane covered with cilia (X820). Courtesy of Armed Forces Institute of Pathology (AFIP 75-9300).

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).

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