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Zorluk: KolayPreventive Care and Immunizations

Parents bring their 8-week-old daughter to the clinic for a well-child examination. The infant was born at full term without any peripartum complications. However, her newborn screening panel returned positive for severe combined immunodeficiency (SCID), which was subsequently confirmed by flow cytometry. She is currently receiving prophylactic antimicrobials and is scheduled for a hematopoietic stem cell transplant in the near future. Vital signs today are within normal limits, and physical examination is unremarkable. The pediatrician and the parents review the infant's immunization schedule. Which of the following vaccines must be withheld from this patient's regimen today?

  1. A
    Diphtheria, tetanus, and acellular pertussis
  2. B
    Haemophilus influenzae type b
  3. C
    Inactivated poliovirus
  4. D
    Pneumococcal conjugate
  5. RotavirusCevap

Cevap

The rotavirus vaccine must be withheld.
The correct answer is the rotavirus vaccine. Patients with severe combined immunodeficiency (SCID) lack functional T cells and B cells, placing them at extreme risk for severe, life-threatening infections. Because live-attenuated vaccines contain active pathogens that can replicate and cause clinical disease in an immunocompromised host, they are absolutely contraindicated. The rotavirus vaccine, administered orally, is the only live-attenuated vaccine on the standard 2-month immunization schedule.

Adım Adım Çözüm

1
Identify the patient's underlying medical condition and its immunological impact.
The patient has severe combined immunodeficiency (SCID), which involves profound defects in cellular (T-cell) and humoral (B-cell) immunity.
Understanding the degree of immunodeficiency is required to determine vaccine safety.
2
Determine the general rule for immunizations in patients with severe cellular immunodeficiency.
Live-attenuated vaccines are absolutely contraindicated because the weakened vaccine strains can replicate uncontrollably and cause severe, disseminated infection.
This is a fundamental principle of preventive care in immunocompromised hosts.
3
Classify the standard 2-month vaccines (DTaP, Hib, IPV, PCV, HepB, Rotavirus) as live or inactivated.
Rotavirus is the only live-attenuated vaccine on the routine 2-month schedule. All others are inactivated toxoid, recombinant, or conjugate vaccines.
Identifying the live vaccine allows for the correct selection of the contraindicated immunization.

Anahtar Kavram

Live-attenuated vaccines are absolutely contraindicated in patients with severe combined immunodeficiency (SCID) due to the risk of uncontrolled vaccine-strain infection.
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Preventive Care and Immunizations

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