Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 8 24.jpg
Blastocystis hominis - granular forms. The avacuolar form changes to a multi-vacuolar form and then a central vacuolar form and then a granular form (all 5-20 microns with 1-4 nuclei) when cultured or passed in faeces. These forms were at first thought to be the typical and only forms of B.hominis but are now known not to be the forms found in the colon. The granular form is similar to the Vacuolar form apart from the presence of granules which vary in contents. Trichrome stain.
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