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Blastocystis hominis is found worldwide, and has an estimated prevalence of approximately 10-15% in developed countries and 30-50% in developing countries (Zierdt). In the United States it is recovered from 1-20% of stool specimens examined for ova and parasites (Blastocystis hominis Infections). Because transmission is believed to be via the fecal-oral route, the presence of the organism may be a marker for the presence of other pathogens spread by fecal contamination (Amin). More recent studies, especially those in tropical or developing countries, suggest waterborne transmission of the pathogen (Leelayoova).



 B. hominis is found worldwide.

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