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Difficulty: MediumInfectious Diseases

Match each clinical exposure scenario with its most appropriate post-exposure prophylaxis or targeted management regimen.

  • A 19-year-old student who shared a small dormitory room with a peer recently diagnosed with meningococcal meningitis.Single-dose oral ciprofloxacin, multidose oral rifampin, or single-dose intramuscular ceftriaxone.
  • A 32-year-old nurse who sustained a deep percutaneous injury with a hollow-bore needle used on a patient with uncontrolled HIV.Three-drug antiretroviral therapy (e.g., tenofovir, emtricitabine, and raltegravir) administered for 28 days.
  • A 45-year-old man who woke up to find a live bat flying in his bedroom, though no visible bite marks or scratches are identified.Administration of human rabies immune globulin (HRIG) and a 4-dose series of the rabies vaccine.
  • A 27-year-old asymptomatic medical resident with a newly positive interferon-gamma release assay (IGRA) and a clear chest radiograph.Oral isoniazid plus rifapentine weekly for 3 months, or daily oral rifampin for 4 months.

Answer

The correct pairings match meningococcal exposure to targeted antibiotic chemoprophylaxis, HIV needlestick to 3-drug antiretroviral therapy, bat exposure to rabies immune globulin and vaccine, and latent tuberculosis to a rifamycin-based or isoniazid-based regimen.
Each clinical exposure mandates a specific, evidence-based prophylactic intervention designed to either eradicate colonization, neutralize viral entry, or prevent the reactivation of a latent infection. The pairings correctly reflect current CDC and professional society guidelines for infectious disease post-exposure management.

Step-by-Step Solution

1
Analyze the infectious exposure in each clinical scenario.
Identified exposures to Neisseria meningitidis, HIV, Rabies virus, and Mycobacterium tuberculosis.
Different pathogens have distinct incubation periods, transmission mechanisms, and pathogenesis that dictate the type of prophylaxis required.
2
Determine the risk level and the goal of management for each exposure.
Determined that all four scenarios meet the threshold for intervention to prevent severe active disease.
Risk stratification ensures that interventions are applied appropriately according to evidence-based guidelines without promoting antimicrobial resistance.
3
Select the guideline-recommended post-exposure prophylaxis or targeted treatment for each identified pathogen.
Matched each exposure to its specific pharmacologic regimen.
Ensures the selected regimens provide the appropriate mechanism of action (e.g., viral suppression, toxin neutralization, or bacterial eradication) for the suspected pathogen.

Key Concept

Evidence-based post-exposure prophylaxis and management of latent infections
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Topics

Infectious Diseases

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