A 15-month-old girl is brought to the clinic for a routine well-child visit. She underwent a liver transplant four months ago due to biliary atresia and is currently maintained on an immunosuppressive regimen of tacrolimus and mycophenolate mofetil. The patient is doing well, and her physical examination is unremarkable. According to her immunization record, she received all recommended vaccines up to 6 months of age, but has not received any vaccines since her transplant. The parents inquire about updating her immunizations. Which of the following is the most appropriate action regarding her immunizations today?
- Administer the pneumococcal conjugate vaccine and withhold the measles, mumps, and rubella (MMR) vaccine.Answer
- BAdminister the measles, mumps, and rubella (MMR) vaccine and withhold the pneumococcal conjugate vaccine.
- CAdminister both the pneumococcal conjugate vaccine and the measles, mumps, and rubella (MMR) vaccine.
- DWithhold all vaccines until the immunosuppressive therapy is completely discontinued.
- EAdminister weight-adjusted fractional doses of all recommended 15-month vaccines.
Answer
Administer the pneumococcal conjugate vaccine and withhold the measles, mumps, and rubella (MMR) vaccine.
This patient is severely immunocompromised due to her post-transplant medication regimen. In such patients, inactivated vaccines like the pneumococcal conjugate vaccine are safe and highly recommended to prevent serious infections. However, live-attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, are strictly contraindicated because the weakened viruses can multiply unchecked and cause severe, disseminated disease.
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Key Concept
In severely immunocompromised pediatric patients, inactivated vaccines are safe and indicated, whereas live-attenuated vaccines are strictly contraindicated due to the risk of uncontrolled vaccine-strain viral replication.