Figure 4. Isospora belli. Left. As seen in jejunal biopsy specimen as large, densely staining, oval bodies in the apical cytoplasm of three enterocytes surrounded by an artifactual clear space (hematoxylin and eosin stain; original magnification, x 400). Right. As seen in feces (modified acid-fast stain; original magnification, x 1000). Actual size, 25 microns.

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