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Question

Difficulty: HardPreventive Care and Immunizations

Match each pediatric patient presentation requiring post-exposure management with the most appropriate immediate preventive intervention.

  • A 9-month-old healthy infant whose older sibling developed a generalized maculopapular rash, cough, coryza, and conjunctivitis 2 days ago.Administer the measles-mumps-rubella (MMR) vaccine
  • A 2-month-old healthy infant whose mother was recently diagnosed with severe, prolonged paroxysmal coughing spells.Prescribe a course of a macrolide antibiotic
  • A 4-year-old previously unimmunized, healthy child whose classmate was diagnosed with an acute hepatitis A infection 5 days ago.Administer the hepatitis A (HepA) vaccine
  • A 12-year-old boy presenting with a deep, soil-contaminated laceration; his records confirm he received only 2 doses of DTaP during infancy.Administer the tetanus-diphtheria-acellular pertussis (Tdap) vaccine AND tetanus immune globulin (TIG)
  • A 6-year-old girl who awoke to find a bat in her bedroom; she has no visible bite marks, but undetected contact cannot be definitively excluded.Administer the rabies vaccine series AND human rabies immune globulin (HRIG)

Answer

The presentations should be matched with their correct post-exposure interventions as follows: the 9-month-old exposed to measles receives the MMR vaccine; the 2-month-old exposed to pertussis receives a macrolide antibiotic; the 4-year-old exposed to hepatitis A receives the HepA vaccine; the 12-year-old with a dirty wound and incomplete tetanus series receives Tdap AND TIG; and the 6-year-old exposed to a bat receives the rabies vaccine AND HRIG.
Appropriate post-exposure prophylaxis depends on the specific pathogen and patient risk factors. Measles PEP requires the MMR vaccine for infants 6-11 months old if administered within 72 hours. Pertussis PEP requires a macrolide for all household contacts. Hepatitis A PEP for healthy patients aged 1-40 years utilizes the HepA vaccine. Tetanus prophylaxis for dirty wounds in under-immunized patients (fewer than 3 prior doses) requires both active (Tdap) and passive (TIG) immunity. Rabies PEP requires both active and passive immunity for any potential bat exposure.

Step-by-Step Solution

1
Analyze the 9-month-old infant exposed to measles.
The infant is older than 6 months and the exposure occurred less than 72 hours ago.
The MMR vaccine provides active post-exposure immunity if given within 72 hours of exposure for infants 6-11 months of age.
2
Evaluate the 2-month-old infant exposed to pertussis.
The infant is a household contact of a symptomatic patient.
Pertussis is highly contagious and life-threatening in young infants; all household contacts must receive chemoprophylaxis with a macrolide.
3
Assess the 4-year-old unimmunized child exposed to hepatitis A.
The child is a healthy individual between 12 months and 40 years old, exposed within the last 14 days.
Active immunization with the HepA vaccine is preferred over immune globulin for healthy patients in this age group.
4
Review the 12-year-old boy with a dirty wound and fewer than 3 documented DTaP doses.
The patient requires both active and passive tetanus immunity.
An incomplete immunization history combined with a severe or contaminated wound mandates both a tetanus toxoid-containing vaccine and TIG.
5
Consider the 6-year-old girl potentially exposed to a bat.
The patient requires full rabies post-exposure prophylaxis.
Undetected contact with a bat in a sleeping environment is considered a high-risk exposure due to the often imperceptible nature of bat bites.

Key Concept

Pediatric Post-Exposure Prophylaxis (PEP)
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Topics

Preventive Care and Immunizations

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