Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 8 05 .jpg
Sites: Gut
Blastocystis hominis EM - Cyst & Wall. The cysts arises from multivacuolar forms in the colon, are about 5 microns wide, usually one (occ. up to 4) nucleus with a crescentic band of chromatin, thick cyst wall and very small vacuoles. This may be the transmissible stage but this has not been proven (EM by Deb Stenzel). (Compare the appearance of these more usually encountered cysts (Normal cysts usually have only one nucleus which has a condensed crescentic band of chromatin) with those of the abnormal cysts in a patient present with severe gastrointestinal symptoms - 6 15 - 6 24)

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