Taxonomy: Class Blastocystea
Animal: Blastocystis hominis (epidemiology) 4 07.jpg
Sites: Gut
Blastocystis hominis - prevalence by month in 1996 in Brisbane, Australia ~ 7 percent of submitted faecal specimens contained B. hominis. B.hominis is ubiquitous world-wide and infection rates don't appear to vary significantly with seasons. Reported prevalence ranges from 2-50 percent (highest in areas of poor hygiene) but many surveys were done on symptomatic people so are not random surveys but in some studies, prevalance in patients with gastrointestinal symptoms were not different from those found in control populations. Equal numbers of males and females are infected; it appears more common in adults than children, travel history is a risk factor.

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