Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 8 13.jpg
Blastocystis hominis - Iodine preparation - Central vacuolar forms have a central vacuole with 1 - 4 nuclei and 5 - 20 microns wide). These are not found in the colon and seem to develop in faeces after excretion from the body and in culture. see EMs in 7 03, 06. Unless the specimen is examined fresh or fixed with PVA or formalin immediately on passing, the in vivo forms ( avacuolar, amoeboid and multi- vacuolar forms) will have deteriorated and only the CV or granular forms will be seen in wet preparations, cysts will be missed if a stained smear is not examined due to their small size - 5 microns.
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