Fungal and Parasitic Infections USMLE Step 1 Practice Question
A 38-year-old man returns from Mexico presenting with fever (38.9°C), right upper quadrant pain, and 4 weeks of intermittent bloody diarrhea. Vital signs show BP 128/82, HR 102, RR 18, SpO2 98% on room air. Examination reveals tender hepatomegaly without jaundice. Ultrasound demonstrates a solitary 5-cm hypoechoic liver abscess. Laboratory studies show elevated transaminases and mild leukocytosis (WBC 11,800). Stool cultures are negative for bacterial pathogens. Which organism most likely caused this patient's condition?
Answer choices
- AEntamoeba histolyticaCorrect answer
- BCryptosporidium parvum
- CAscaris lumbricoides
- DEchinococcus granulosus
- EGiardia lamblia
- FEntamoeba moshkovskii
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