Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 6 16b.jpg
Sites: Gut
Blastocystis hominis cysts (see just off centre). Cysts arise from the avacuolar and multivacuolar forms in the colon, is about 5 microns wide, usually one nucleus, thick cyst wall and very small vacuoles. This may be the transmissible stage but this has not been proven (Trichrome stain of faecal preparation).

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