Figure 3. Enterocytozoon bieneusi. Left. As seen in jejunal biopsy specimen as irregular oval bodies in the apical cytoplasm of most of the enterocytes (hematoxylin and eosin stain; original magnification, x 400). Right. As seen in the feces as red-pink oval spores mixed among blue bacteria (modified trichrome stain; original magnification, x 1000). Actual size, 1 micron.