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Difficulty: HardPreventive Care and Screening

A 24-year-old man comes to the clinic for a follow-up visit. Six weeks ago, he underwent an emergency splenectomy due to blunt abdominal trauma sustained in a snowboarding accident. His postoperative course in the hospital was uncomplicated. Prior to this event, he was healthy, and his medical records indicate he is up to date on all routine childhood immunizations. Before being discharged from the hospital 5 weeks ago, he received the 20-valent pneumococcal conjugate vaccine (PCV20) and the first dose of the quadrivalent meningococcal conjugate vaccine (MenACWY). He currently takes no medications and feels well. Vital signs are within normal limits. Which of the following is the most appropriate next step in this patient's preventive care?

  1. Administer the serogroup B meningococcal (MenB) vaccineAnswer
  2. B
    Administer the 23-valent pneumococcal polysaccharide vaccine (PPSV23)
  3. C
    Administer the Haemophilus influenzae type b (Hib) vaccine
  4. D
    Administer the live-attenuated influenza vaccine (LAIV)
  5. E
    Prescribe daily prophylactic amoxicillin

Answer

The most appropriate next step is to administer the serogroup B meningococcal (MenB) vaccine.
Patients with anatomic or functional asplenia are at a significantly increased risk of overwhelming post-splenectomy infection (OPSI), primarily from encapsulated organisms such as Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. To prevent meningococcal disease, current ACIP guidelines mandate vaccination against both serogroups A, C, W, Y (MenACWY) and serogroup B (MenB). Because MenB is not a routine childhood vaccine (it is only recommended via shared clinical decision-making for healthy adolescents), this patient is naïve to it. Initiating the MenB vaccine series is the most appropriate next step. Note that while he also needs a second dose of MenACWY to complete that primary series, the interval between doses for asplenic adults is 8 weeks; since he received his first dose 5 weeks ago, he is not yet due for the second dose.

Step-by-Step Solution

1
Identify the patient's acquired immunodeficiency state.
The patient has anatomic asplenia following an emergency trauma splenectomy.
Asplenia severely impairs the body's ability to clear encapsulated organisms, dictating specific immunization pathways.
2
Determine the required vaccinations for asplenia.
The patient needs coverage against Streptococcus pneumoniae, Neisseria meningitidis (ACWY and B), and Haemophilus influenzae type b.
These are the primary encapsulated pathogens that cause overwhelming post-splenectomy infection (OPSI).
3
Evaluate the patient's current vaccination status against current guidelines.
The patient is up to date on Hib (childhood), has completed pneumococcal coverage (received PCV20 in hospital, no PPSV23 needed), and started MenACWY (dose 2 due at 8 weeks, not yet due at 5 weeks post-discharge).
Comparing administered vaccines to current ACIP guidelines reveals any remaining gaps in coverage.
4
Identify the missing intervention appropriate for today's visit.
The patient has not received the MenB vaccine, which is required for asplenic patients and is not given during routine childhood schedules.
Initiating the MenB series addresses the remaining susceptibility to a major encapsulated pathogen.

Key Concept

Adult immunization guidelines for asplenia
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Topics

Preventive Care and Screening

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