USMLE Q Bank Step 1-8

A 38 year old man is brought to the emergency room because of palpitation and shortness of breath for 4 hours. He travelled to Brazil two years ago on a business trip. He was bitten there by a fly and was treated by analgesics for a few weeks due to fever and headaches. On examination, heart rate is 150 with shifting of the apex to the left. Imaging studies and further investigations show cardiomyopathy.

What is the organism most likely responsible for this condition?

A- Staphylococcus aureus

B- Streptococcus pyogenes

C- Ascaris lumbricoides

D- Trypanosoma cruzi

E- Trichophyton rubrum


This is a case of Chagas disease caused by Trypanosoma cruzi and also called American trypanosomiasis. It is spread to human through insects called Triatominae and also known as kissing bug. It lives in Central and South America. Infection with this microorganism causes severe myocarditis and leads to cardiomyopathy.

The correct answer is D

2 thoughts on “USMLE Q Bank Step 1-8”

  1. Thank you Dr Lazarous

  2. thanks helping us zs way

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