Giardiasis Treatment — Medical Practice MCQ

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Moderate"Infectious Diseases"Giardiasis Treatment

A 38-year-old with two weeks of watery diarrhea after travel has positive Giardia antigen. Best treatment?

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Correct answer: A — Metronidazole 500 mg PO TID for 5-7 days

Explanation lettering: E = shown as C · C = shown as D · D = shown as E

Metronidazole or tinidazole are first-line for giardiasis. Vancomycin treats C. difficile (B). Ciprofloxacin is for bacterial pathogens (C). Albendazole is for helminths (D). Supportive care alone is inadequate (E).

Reference: Secondary Source: CDC (2024): Giardiasis Clinical Care