Blastocystis hominis cyst-like forms in wet mounts

  • Blastocystis hominis appear as spherical to oval cyst-like structures. They vary widely in size (5 to 30 µm; usual range 8 to 10 µm), and typically consist of a central body, or “vacuole,” surrounded by a thin rim of cytoplasm containing up to six nuclei.
  • The vacuoles stain variably from red to blue in trichrome stain, which is preferred to wet mounts as the organisms can be overlooked as debris .
Blastocystis hominis

Blastocystis hominis

 

 

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