Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 3 19.jpg
Blastocystis hominis - amoeboid form (these forms inhabit the colon along with small avacuolar forms but may be overlooked because of their small size, 5 microns or because they degenerate after passage). Bt bacteria, Ly lysosome- like organelles, n crescentic condensed chromatin band in nucleus, Nu nucleus, Pd pseudopod. (EM by Deb Stenzel). It is believed that the avacuolar forms, amoeboid forms and multivacuolar forms are the forms present in vivo and these develop to cysts in the external environment or develop into vacuolar forms if cultured. If the specimen is not examined fresh or fixed with PVA or formalin immediately on passing, these in vivo forms will have deteriorated and only the central vacuolar 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. - light microscopy being the usual way to examine faecal samples.
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