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Parasitol Res. 1995;81(5):446-50.

Elucidation of the life cycle of the intestinal protozoan Blastocystis hominis.

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Department of Microbiology, Faculty of Medicine, National University of Singapore, Kent Ridge.


This paper elucidates the status of the different morphological forms of Blastocystis and reports the existence of thin- and thick-walled cysts in B. hominis on the basis of current experimental evidence. It is suggested that the thin-walled cysts are autoinfectious, leading to multiplication of the organism in the intestinal tract. The thick-walled cysts are responsible for external transmission via the faecal-oral route. A life cycle for B. hominis is postulated on the basis of these findings.

[Indexed for MEDLINE]

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