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Cystoisospora belli infections in humans: the past 100 years

Published online by Cambridge University Press:  09 August 2019

J. P. Dubey Open the ORCID record for J. P. Dubey [Opens in a new window]  and
S. Almeria
J. P. Dubey*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Service, Animal Parasitic Disease Laboratory, Building 1001, BARC-East, Beltsville, MD 20705-2350, USA
S. Almeria
Affiliation:
Departmentof Health and Human Services, Food and Drug Administration, Center for Food Safety and Nutrition, Office of Applied Research and Safety Assessment, Division of Virulence Assessment, Laurel, MD 20708, USA
*
Author for correspondence: J. P. Dubey, E-mail: [email protected]
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Abstract

Cystoisospora belli is a coccidian parasite of humans, with a direct fecal–oral transmission cycle. It is globally distributed, but mainly found in tropical and subtropical areas. Many cases of C. belli infections have been reported in patients with HIV, and in patients undergoing immunosuppressive therapy for organ transplants or those treated for tumours worldwide. Unsporulated or partially sporulated oocysts of C. belli are excreted in feces. When sporulated oocysts in contaminated water or food are ingested, asexual and sexual stages of C. belli are confined to the epithelium of intestines, bile ducts and gallbladder. Monozoic tissue cysts are present in extra-intestinal organs (lamina propria of the small and large intestine, lymph nodes, spleen, and liver) of immunosuppressed humans. However, a paratenic host has not been demonstrated. Cystoisospora belli infections can be persistent, lasting for months, and relapses are common; the mechanism of relapse is unknown. Recently, the endogenous stages of C. belli were re-examined and attention was drawn to cases of misidentification of non-protozoal structures in the gallbladder of patients as C. belli. Here, we review all aspects of the biology of C. belli, including morphology, endogenous stages, prevalence, epidemiology, symptoms, diagnosis and control.

Keywords

CycleCystoisospora bellidiagnosisdistributionhumanssymptomstreatment
Type
Review Article
Information
Parasitology , Volume 146 , Issue 12 , October 2019 , pp. 1490 - 1527
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Copyright © Cambridge University Press 2019 

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