According to IDSA and SHEA guidelines, which oral antimicrobial is recommended as first-line therapy for an initial episode of non-severe Clostridioides difficile infection?
Answer and explanation
Correct answer: D. Oral Fidaxomicin or Oral Vancomycin
- Step 1: Updated clinical practice guidelines prioritize agents with high luminal concentrations and minimal systemic absorption for C. difficile colitis.
- Step 2: IDSA/SHEA guidelines establish oral Fidaxomicin (200 mg BID for 10 days) or oral Vancomycin (125 mg QID for 10 days) as the preferred first-line treatment. Oral Metronidazole is no longer recommended as first-line therapy due to inferior sustained clinical cure rates.
Answer
Oral Fidaxomicin or Oral Vancomycin.
Why not the others: Oral metronidazole is now considered alternative therapy only when first-line agents are unavailable; ciprofloxacin and amoxicillin are common triggers for C. difficile, not treatments.
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