A patient with prolonged diarrhea undergoes esophagogastroduodenoscopy. Biopsy of the small intestine demonstrates numerous crescent-shaped protozoa adjacent to the epithelial brush border. Which of the following organisms is the most likely pathogen? A. Entamoeba histolytica B. Escherichia coli C. Giardia lamblia D. Naegleria fowleri E. Trichomonas vaginalis
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gardia lambia
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