Question:
A child has been on treatment for acute lymphoblastic leukaemia (ALL) for 5 months. When should the MMR vaccine be administered?
A child has been on treatment for acute lymphoblastic leukaemia (ALL) for 5 months. When should the MMR vaccine be administered?
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Vaccination in Pediatric Cancer Survivors:
$\bullet$ Live vaccines (MMR, Varicella): Withhold during therapy; administer $\ge 6\text{ months}$ AFTER completion of chemotherapy.
$\bullet$ Inactivated vaccines: Can be given $\ge 3\text{ months}$ post-chemotherapy.
$\bullet$ Live vaccines (MMR, Varicella): Withhold during therapy; administer $\ge 6\text{ months}$ AFTER completion of chemotherapy.
$\bullet$ Inactivated vaccines: Can be given $\ge 3\text{ months}$ post-chemotherapy.
Updated On: Sep 3, 2026
- MMR is contraindicated
- Give after completion of therapy
- Anytime
- Give during maintenance therapy if the lymphocyte count is normal
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The Correct Option is B
Solution and Explanation
Concept:
The MMR (Measles, Mumps, Rubella) vaccine is a live-attenuated viral vaccine.
In patients undergoing active chemotherapy for hematologic malignancies like Acute Lymphoblastic Leukemia (ALL), profound cell-mediated and humoral immunosuppression contraindicates the administration of all live vaccines due to the risk of severe vaccine-strain viral replication and dissemination.
Explanation:
• Immunosuppressive chemotherapy severely depletes T-cell and B-cell populations, impairing the host's ability to clear attenuated viral strains, which can lead to life-threatening complications such as measles inclusion body encephalitis or giant cell pneumonia.
• Current international guidelines (CDC, AAP, and IDSA) state that live-attenuated vaccines, including MMR and Varicella, are strictly contraindicated during active chemotherapy (including induction, consolidation, and maintenance phases).
• Following the completion of chemotherapy, immune reconstitution gradually occurs over several months.
• Live-attenuated vaccines such as MMR should be administered only after the completion of all immunosuppressive therapy, with guidelines recommending a minimum waiting period of $3\text{ to 6\text{ months}$} post-chemotherapy (provided the disease is in remission and total lymphocyte counts have normalized).
• Inactivated vaccines can typically be administered starting 3 months after chemotherapy completion, with revaccination strategies to ensure protective titers.
Final Answer:
The MMR vaccine must be withheld during active chemotherapy and should be administered after the completion of therapy once immune recovery has occurred.
The MMR (Measles, Mumps, Rubella) vaccine is a live-attenuated viral vaccine.
In patients undergoing active chemotherapy for hematologic malignancies like Acute Lymphoblastic Leukemia (ALL), profound cell-mediated and humoral immunosuppression contraindicates the administration of all live vaccines due to the risk of severe vaccine-strain viral replication and dissemination.
Explanation:
• Immunosuppressive chemotherapy severely depletes T-cell and B-cell populations, impairing the host's ability to clear attenuated viral strains, which can lead to life-threatening complications such as measles inclusion body encephalitis or giant cell pneumonia.
• Current international guidelines (CDC, AAP, and IDSA) state that live-attenuated vaccines, including MMR and Varicella, are strictly contraindicated during active chemotherapy (including induction, consolidation, and maintenance phases).
• Following the completion of chemotherapy, immune reconstitution gradually occurs over several months.
• Live-attenuated vaccines such as MMR should be administered only after the completion of all immunosuppressive therapy, with guidelines recommending a minimum waiting period of $3\text{ to 6\text{ months}$} post-chemotherapy (provided the disease is in remission and total lymphocyte counts have normalized).
• Inactivated vaccines can typically be administered starting 3 months after chemotherapy completion, with revaccination strategies to ensure protective titers.
Final Answer:
The MMR vaccine must be withheld during active chemotherapy and should be administered after the completion of therapy once immune recovery has occurred.
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