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Question

Difficulty: MediumPediatric Infectious Diseases

Match each pediatric infectious disease exposure scenario with the most appropriate post-exposure management or prophylaxis strategy.

  • A 2-month-old infant whose mother was just diagnosed with acute pertussisOral azithromycin course
  • An unvaccinated 4-year-old child who was exposed to a confirmed case of measles 48 hours agoAdministration of the measles, mumps, and rubella (MMR) vaccine
  • A 6-year-old child whose sibling developed meningococcal meningitis yesterdayOral rifampin course
  • A 5-year-old child who sustained a superficial provoked bite on the leg from a healthy, fully vaccinated neighborhood dogRoutine wound care and observation of the animal for 10 days

Answer

Pertussis exposure requires azithromycin. Measles exposure within 72 hours requires the MMR vaccine. Meningococcal exposure requires rifampin. A superficial bite from a healthy, observable dog requires wound care and 10 days of animal observation.
Each scenario represents a classic high-yield exposure requiring specific post-exposure management based on standard infectious disease guidelines. Pertussis requires macrolide prophylaxis for close contacts. Measles can be aborted with early MMR vaccination. Meningococcal contacts need chemoprophylaxis with rifampin. Observable domestic dogs do not mandate immediate rabies prophylaxis.

Step-by-Step Solution

1
Evaluate the pertussis exposure in the 2-month-old infant.
Identify the need for macrolide prophylaxis.
Pertussis is highly contagious, and young infants are at the highest risk for severe, life-threatening complications. Household contacts require immediate prophylaxis with a macrolide such as azithromycin.
2
Evaluate the measles exposure in the unvaccinated 4-year-old child.
Identify the need for the MMR vaccine.
The MMR vaccine provides effective post-exposure prophylaxis for immunocompetent children if it is administered within 72 hours of the initial measles exposure.
3
Evaluate the meningococcal exposure in the 6-year-old child.
Identify the need for rifampin prophylaxis.
Close household contacts of individuals with meningococcal disease need eradication of nasopharyngeal carriage using appropriate antibiotics such as rifampin, ceftriaxone, or ciprofloxacin.
4
Evaluate the dog bite in the 5-year-old child.
Identify that immediate rabies prophylaxis is unnecessary.
Because the bite was provoked and the dog is healthy, vaccinated, and available for a 10-day quarantine, the appropriate clinical step is simple wound care and observation of the animal for signs of rabies.

Key Concept

Post-exposure prophylaxis protocols for common pediatric infectious diseases and high-risk exposures.
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Topics

Pediatric Infectious Diseases

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