Taxonomy: f. Enteromonadidae
Animal: Enteromonas sp. 12 10 .jpg
Sites: Gut
Enteromonas-like cyst from a faecal preparation fixed with PVA and stained with Trichrome. This cyst was oval with 4 nuclei and 8 microns long from a specimen from a 50 year old female with 2 months history of diarrhoea following a trip to Africa. Cysts like this were present in 4 stool samples presented over a 6 week period. Also present were Entamoeba coli trophozoites and cysts. No pathogenic organisms were isolated and the cause of her symptoms was not identified. These small cysts were considered to be Enteromonas hominis cysts which are 4 - 10 x 4 - 6 microns, elongate or oval with 1 - 4 nuclei, usually 2 at opposite ends of cyst. They resemble Endolimax nana cyst, although this rarely has only 2 nuclei. These parasites are often not reported because of their small size and the difficulties in identification under LM. They are considered non-pathogenic but are little studied. EM was performed on this specimen to assist in identification. (see 12 02, 12 03)

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