Mycology/Parasitology USMLE Step 1 Practice Question
A 6-year-old boy from rural Peru presents with fatigue, abdominal distension, and intermittent diarrhea for 6 months. Stool microscopy reveals 44-76 μm oval ova with a mucoid plug at one end. He spends time barefoot in contaminated soil near his home. Which of the following is the most likely diagnosis?
Answer choices
- ATrichuris trichiura infection
- BSchistosoma mansoni infection
- CAscaris lumbricoides infectionCorrect answer
- DAncylostoma duodenale infection
- EStrongyloides stercoralis infection
- FNecator americanus
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