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Entamoeba histolytica (Amebiasis)

Summary of Entamoeba histolytica (Amebiasis)
Entamoeba histolytica is an anaerobic parasitic protozoan that causes amoebiasis, presenting with either bloody diarrhea or liver abscesses with an "anchovy paste" exudate. Histology shows flask-shaped ulcers in gastrointestinal submucosa. Transmission is through cysts in water. Diagnosis is made either with serology, or with stool examination showing trophozoites or cysts in it. Metronidazole is the drug of choice; iodoquinol is used for asymptomatic carriers who pass cysts in their stool.

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Entamoeba histolytica (Amebiasis)

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Entamoeba histolytica (Amebiasis)

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Serology or examination with trophozoites or cysts in it are the two main tests for diagnosis of Entamoeba histolytica infection.

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USMLE® Step 2 style questions USMLE

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A 44-year-old man comes to the emergency department because of bloody diarrhea for the past 7 days. His temperature is 38.5°C (101.3°F), pulse is 112/min, respirations are 12/min, and blood pressure is 110/90 mm Hg. Abdominal examination shows right upper quadrant tenderness without rebound, guarding, or rigidity. CT of the abdomen shows a single liver cyst. A stool sample is obtained. Which of the following is the most likely cause of this condition?

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