Microbial diagnostics · USMLE Step 1

A nasopharyngeal swab is obtained from a patient with influenza-like illness. Which test provides the fastest and most accurate diagnosis?

  1. Rapid antigen test
  2. PCR-based respiratory panel
  3. Viral culture
  4. Hemagglutination inhibition test
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Correct answer: PCR-based respiratory panel

PCR-based respiratory panels detect influenza and other respiratory viruses with high sensitivity and rapid turnaround.

Difficulty: Medium Question 14 of 20

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