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Blastocystis hominis infection
[Blastocystis hominis]
Blastocystis hominis, trichrome stain Blastocystis hominis, trichrome stain
A B

Blastocystis hominis, trichrome stain Blastocystis hominis, trichrome stain
C D

A, B, C, D: Blastocystis hominis cyst-like forms stained in trichrome.  The sizes vary from 4 µm to 10 µm.  The vacuoles stain variably from red to blue.  The nuclei in the peripheral cytoplasmic rim are clearly visible, staining purple, in Figure B (4 nuclei).  Specimens in Figures A-C contributed by Dr. Ray Kaplan, SmithKline Beecham Diagnostic Laboratories, Atlanta, GA.

 

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