A 5-year-old boy presents to the outpatient clinic for a pre-kindergarten health maintenan… — USMLE Step 2 CK

A 5-year-old boy presents to the outpatient clinic for a pre-kindergarten health maintenance examination. His mother states he is doing well overall, though he recently had a flare-up of his underlying minimal change disease. Four weeks ago, he was started on oral prednisone at a dose of $2\text{ mg/kg}$ daily. He is currently on day $28$ of this regimen, with plans to begin tapering next week. His other daily medications include an age-appropriate dose of calcium and vitamin D supplementation. Review of his immunization registry reveals that he is up to date with all vaccines recommended through $18$ months of age, but he has not yet received his preschool vaccine boosters. He is currently due for his $5$ th dose of DTaP, $4$ th dose of IPV, $2$ nd dose of MMR, and $2$ nd dose of varicella vaccines. Vital signs today are within normal limits for his age, and physical examination is unremarkable. Which of the following is the most appropriate recommendation regarding his immunizations today?

Administer DTaP and IPV today; defer MMR and varicella vaccines until at least one month after prednisone discontinuationCevap
B
Administer DTaP, IPV, MMR, and varicella vaccines today as scheduled
C
Defer all immunizations until the patient has completely tapered off the oral prednisone regimen
D
Administer DTaP, IPV, and MMR today; defer the varicella vaccine until at least one month after prednisone discontinuation
E
Administer DTaP and IPV today; perform serologic testing for measles, mumps, rubella, and varicella before deciding on live vaccination

Cevap

Administer DTaP and IPV today; defer MMR and varicella vaccines until at least one month after prednisone discontinuation

The correct recommendation is to administer the inactivated vaccines (DTaP and IPV) today while safely deferring the live-attenuated vaccines (MMR and varicella). This patient is receiving high-dose systemic corticosteroids, strictly defined by the CDC as a dose of

\geq 2\text{ mg/kg/day}

\geq 20\text{ mg/day}

of prednisone (or equivalent) administered for

\geq 14

consecutive days. This level of pharmacologic immunosuppression significantly impairs cellular immunity, creating a high risk for disseminated, potentially fatal disease if a live-attenuated vaccine is given. Therefore, live vaccines such as MMR, varicella, and the live-attenuated intranasal influenza vaccine are absolutely contraindicated. Conversely, inactivated vaccines (such as DTaP and IPV) do not contain live virus and cannot replicate, making them safe to administer to immunocompromised patients. While the immune response to inactivated vaccines may be slightly blunted, they should be given according to the standard schedule to avoid unnecessary delays in protection. To ensure adequate immune recovery, live vaccines should be deferred until at least

1

month after the high-dose corticosteroid therapy has been entirely discontinued.

Adım Adım Çözüm

Identify the patient's level of immunosuppression based on his medication history.

The patient is taking oral prednisone at

2\text{ mg/kg}

daily for

28

days.

High-dose systemic corticosteroids (defined as

\geq 2\text{ mg/kg/day}

\geq 20\text{ mg/day}

for

\geq 14

consecutive days) cause significant cellular immunosuppression.

Determine the contraindications for the vaccines due at this visit.

Live-attenuated vaccines (MMR and varicella) are strictly contraindicated. Inactivated vaccines (DTaP and IPV) are safe to administer.

Live-attenuated vaccines carry a severe risk of unchecked viral replication and disseminated disease in immunocompromised hosts. Inactivated vaccines cannot replicate.

Establish the timeline for safely administering the deferred live-attenuated vaccines.

MMR and varicella vaccines must be deferred until at least

1

month after the high-dose corticosteroid therapy is discontinued.

It takes approximately

1

month for the immune system to sufficiently recover cellular function after discontinuing high-dose systemic steroids.

Anahtar Kavram

Contraindications for live-attenuated vaccines in pediatric patients receiving high-dose systemic corticosteroids

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