Which microscopic finding is virtually diagnostic for a vegetative (trophozoite) stage of Entamoeba histolytica containing ingested red blood cells?
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Correct answer: Erythrophagocytosis
Erythrophagocytosis, or the presence of ingested RBCs in the cytoplasm of a trophozoite, is a definitive feature used to distinguish pathogenic E. histolytica from the morphologically identical non-pathogenic E. dispar.
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