Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 4 12.jpg
Sites: Gut
Blastocystis hominis abnormal cyst. Large numbers of this unusual form were seen in the faeces of a patient with acute severe gastroenteritis. Symptoms resolved in 12 days without treatment and no cysts, erythrocytes or leucocytes were present in the faeces on discharge. These cysts were 5 or 6 microns wide, mostly multi-nuclei (red dots), thick cell wall (blue) and large amounts of glycogen as seen with iodine stain. (Trichrome stain of faecal preparation, unusual features were seen most clearly with EM).

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