Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 8 14.jpg
Sites: Gut
Blastocystis hominis - Saline preparation - central vacuolar form (centre) which has a central vacuole with 1 - 4 nuclei and 5 - 20 microns wide). 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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