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Amebiasis
[Entamoeba histolytica]

Mature Entamoeba histolytica/Entamoeba dispar cysts have 4 nuclei that characteristically have centrally-located karyosomes and fine, uniformly distributed peripheral chromatin.  Cysts usually measure 12 to 15 µm.

Entamoeba histolytica/dispar cyst in wet mount Entamoeba histolytica/dispar cyst in wet mount
A B

A, B: Cysts of E. histolytica/E. dispar in an unstained concentrated wet mount of stool.  Notice the chromatoid bodies with blunt, rounded ends (arrows).

Entamoeba histolytica/dispar cyst in wet mount Entamoeba histolytica/dispar cyst in wet mount
C D

C, D: Cysts of E. histolytica/E. dispar in a concentrated wet mount stained with iodine.  Notice the chromatoid body with blunt, rounded ends in Figure D (arrow).

 

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