A healthcare professional sustains an accidental deep percutaneous needlestick injury with a hollow-bore needle contaminated with fresh blood from a known HIV-positive patient with detectable viral load. According to CDC and UAE national infection prevention guidelines, within what time frame should Post-Exposure Prophylaxis (PEP) ideally be initiated?

Answer and explanation

Correct answer: A. Within 1 to 2 hours, and no later than 72 hours post-exposure

  1. Step 1: HIV Post-Exposure Prophylaxis (PEP) with a 3-drug antiretroviral regimen should be initiated as urgently as possible, ideally within 1 to 2 hours of exposure.
  2. Step 2: Efficacy declines steeply after 24-48 hours, and PEP is not recommended if initiated beyond 72 hours post-exposure.
Answer
Within 1 to 2 hours, and no later than 72 hours post-exposure.
Why not the others: 'Within 7 days' is too late as viral integration into host lymphoid reservoirs has already occurred; 'Waiting for 6-week serology' misses the therapeutic window entirely; 'Waiting for symptoms' permits established, irreversible chronic HIV infection.

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