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Question

Difficulty: EasyInfectious Diseases

Match each clinical exposure scenario with the most appropriate first-line post-exposure prophylaxis (PEP) or immediate management strategy.

  • A 20-year-old college student whose dormitory roommate was just diagnosed with meningococcal meningitisOral ciprofloxacin, rifampin, or intramuscular ceftriaxone
  • A healthcare worker who sustained a deep needlestick injury from a patient with an unsuppressed HIV viral loadThree-drug antiretroviral therapy for 28 days
  • A hiker who removed an engorged Ixodes scapularis tick that had been attached for 48 hours in a Lyme-endemic areaSingle-dose oral doxycycline
  • A 35-year-old who awoke to find a bat in their bedroom and cannot completely rule out a bite or scratchRabies immune globulin and rabies vaccine series

Answer

Meningococcal exposure matches with ciprofloxacin/rifampin/ceftriaxone; HIV exposure matches with 3-drug antiretroviral therapy; Tick bite (>36 hours) matches with single-dose doxycycline; Bat exposure matches with rabies immune globulin and vaccine.
Each correct pairing reflects the standard of care guidelines for post-exposure prophylaxis in infectious diseases. Preventing disease after exposure relies on targeting the specific organism's vulnerabilities before it establishes a systemic infection.

Step-by-Step Solution

1
Analyze each exposure scenario to identify the specific high-risk pathogen involved.
Pathogens identified: Neisseria meningitidis, Human Immunodeficiency Virus (HIV), Borrelia burgdorferi, and Rabies virus.
Different pathogens have entirely distinct pathophysiologies and modes of transmission, dictating specific prophylaxis guidelines.
2
Select the guideline-concordant prophylactic agent for each pathogen.
Meningococcus requires antibiotics to clear carriage (ciprofloxacin). HIV requires ART to prevent viral integration. Lyme requires a tetracycline to abort spirochete replication. Rabies requires immediate passive and active immunization to prevent fatal encephalitis.
Applying the correct targeted therapy rapidly reduces the risk of disease manifestation and prevents the misuse of inappropriate antimicrobials.

Key Concept

Identifying appropriate post-exposure prophylaxis (PEP) regimens for common high-risk infectious disease exposures.
Estimated Time:1m 0s
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Topics

Infectious Diseases

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