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ChapterMicrobiology Protozoa/Helminths

Antiparasitic medications

Free notes, MCQs, tables & flowcharts for USMLE Step 3 Microbiology

10Questions
10Flashcards
1Tables & Flowcharts

Sample Questions

1

A 29-year-old man from India seeks evaluation at a clinic with complaints of sore muscles and lethargy of several days duration. After the physical examination and laboratory testing, the patient is asked to stay for treatment and monitoring. Despite the physician’s warning, the patient leaves the hospital against medical advice. He subsequently develops difficulty in breathing and anuria and is brought to the emergency department with loss of consciousness. The patient gets an immediate T2 weighted image of his head, which is shown in the exhibit. Laboratory findings confirm the presence of rings, which appear on the periphery of red blood cells (RBCs). What is the best treatment for his condition?

AAtovaquone-proguanil

BPrimaquine

CMefloquine

DChloroquine

EIntravenous artesunate

2

A 7-year-old girl is brought to the physician by her mother because of a 4-week history of irritability, diarrhea, and a 2.2-kg (5-lb) weight loss that was preceded by a dry cough. The family returned from a vacation to Indonesia 2 months ago. Her vital signs are within normal limits. Abdominal examination shows mild tenderness with no guarding or rebound and increased bowel sounds. Her leukocyte count is 9,200/mm3 with 20% eosinophils. A photomicrograph of a wet stool mount is shown. Which of the following is the most appropriate pharmacotherapy?

ADiethylcarbamazine

BMetronidazole

CAlbendazole

DPraziquantel

EDoxycycline

3

A 21-year-old male presents after several days of flatulence and greasy, foul-smelling diarrhea. The patient reports symptoms of nausea and abdominal cramps followed by sudden diarrhea. He says that his symptoms started after he came back from a camping trip. When asked about his camping activities, he reports that his friend collected water from a stream, but he did not boil or chemically treat the water. His temperature is 98.6°F (37°C), respiratory rate is 15/min, pulse is 67/min, and blood pressure is 122/98 mm Hg. Stool is sent for microscopy which returns positive for motile protozoans. Which of the following antibiotics should be started in this patient?

AVancomycin

BErythromycin

CCephalexin

DCiprofloxacin

EMetronidazole

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