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Difficulty: MediumInfectious Diseases

A 28-year-old resident physician sustains a deep percutaneous needlestick injury to her thumb while drawing arterial blood from a patient. The patient has a known history of untreated HIV with a viral load of 250,000 copies/mL. The needle is visibly contaminated with the patient's blood. Arrange the following steps in the most appropriate chronological order for the management of this occupational exposure.

  1. 1Wash the puncture site thoroughly with soap and water.
  2. 2Obtain baseline HIV, hepatitis B, and hepatitis C serologies from the exposed resident.
  3. 3Initiate a 28-day post-exposure prophylaxis regimen with tenofovir, emtricitabine, and raltegravir.
  4. 4Perform follow-up HIV antibody and antigen testing at 6 weeks, 12 weeks, and 6 months.

Answer

The correct sequence is to perform immediate first aid (washing the wound), obtain baseline serological testing, initiate a 3-drug post-exposure prophylaxis regimen, and finally conduct longitudinal follow-up testing.
Occupational exposures to HIV require a standardized, chronological approach to maximize safety and efficacy. Immediate first aid (washing) physically decreases the pathogen load. Administrative reporting and baseline serologies establish the worker's initial status. Because viral integration can occur rapidly, empiric 3-drug antiretroviral post-exposure prophylaxis must be started immediately following baseline testing, without waiting for the lab results. Finally, longitudinal serologic follow-up is necessary because HIV seroconversion can be delayed up to 6 months.

Step-by-Step Solution

1
Wash the puncture site thoroughly with soap and water.
Viral bioburden at the inoculation site is physically reduced.
First aid is the most immediate, time-sensitive action to minimize systemic entry of the virus.
2
Obtain baseline HIV, hepatitis B, and hepatitis C serologies from the exposed resident.
The resident's pre-exposure serological status is documented.
Baseline testing is essential for occupational health records and ensures PEP is not inadvertently used as inadequate therapy for an unrecognized pre-existing infection.
3
Initiate a 28-day post-exposure prophylaxis regimen with tenofovir, emtricitabine, and raltegravir.
Systemic antiretroviral therapy is established.
To prevent viral replication and integration into the host genome, PEP must be started rapidly (optimally within 2 hours, up to 72 hours).
4
Perform follow-up HIV antibody and antigen testing at 6 weeks, 12 weeks, and 6 months.
Long-term monitoring for seroconversion is completed.
The incubation period for HIV means seroconversion might not be detectable immediately; longitudinal follow-up is necessary to confirm the exposure did not result in infection.

Key Concept

Management sequence for high-risk occupational HIV exposure
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Topics

Infectious Diseases

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