ATLASINTESTINAL PARASITES (Protozoa)
      INCERTAE SEDIS

      BLASTOCYSTIS HOMINIS

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      B.hominis is a protozoan parasite of the large intestin with
      a wide range of morphologic forms.
      It is frequently observed in faeces of asymptomatic individuals (1-20%)
      like an harmless commensal but it has been sometimes
      correlated with chronic diarrhea.


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      B.hominis: The diagnostic form of the parasite is the vacuolated form that
      measures 5-30 µm with a central vacuole and a peripheral cytoplasm
      containing some granules and two to three nuclei.
      It does not form cysts and divides by binary fission.
      (Wet mount).

      By doctor Tim Clarke, Senior BMS

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      B.hominis: Trichrome stain.

      By Dr. Marc Lontie

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      B.hominis: in a stool smear,
      stained with Gram.

      Courtesy of  Dr. Marc Lontie:
      Director of the laboratory of the Medisch Centrum voor Huisartsen,
      Maria Theresiastraat 63a; B-3000 Leuven, Belgium.