An 18-month-old child who had Varicella exposure and received VariZIG is evaluated for kindergarten vaccines 5 months after stopping chemotherapy. Which vaccine plan is appropriate?

An 18-month-old child who had Varicella exposure and received VariZIG is evaluated for kindergarten vaccines 5 months after stopping chemotherapy. Which vaccine plan is appropriate?

• A. MMR and Tdap
• B. MMR, Varivax, Tdap
• C. Tdap only
• D. Varivax and Tdap

Answer: (B)

When a child finishes chemotherapy, the immune system needs time to rebound before giving live vaccines. Live vaccines like MMR and varicella are typically deferred during treatment and only started again once there is evidence of immune reconstitution. Non-live vaccines, such as Tdap, can be given once it’s considered safe to vaccinate. In this case, about five months after stopping chemotherapy, the child is in a window where reconstitution may be sufficient to tolerate live vaccines. Administering both MMR and Varicella (Varivax) at the same visit pairs well with catch-up practice and helps restore protection against measles, mumps, rubella, and varicella efficiently. Adding Tdap at the same visit provides protection against tetanus, diphtheria, and pertussis, which is important for kindergarten entry and general immunity. Varicella exposure with Varizig (VariZIG) is post-exposure prophylaxis and does not replace vaccination for long-term immunity. Therefore, a plan to vaccinate with MMR, Varicella, and Tdap at this time best supports ongoing immunologic recovery and upcoming school requirements.

When a child finishes chemotherapy, the immune system needs time to rebound before giving live vaccines. Live vaccines like MMR and varicella are typically deferred during treatment and only started again once there is evidence of immune reconstitution. Non-live vaccines, such as Tdap, can be given once it’s considered safe to vaccinate.

In this case, about five months after stopping chemotherapy, the child is in a window where reconstitution may be sufficient to tolerate live vaccines. Administering both MMR and Varicella (Varivax) at the same visit pairs well with catch-up practice and helps restore protection against measles, mumps, rubella, and varicella efficiently. Adding Tdap at the same visit provides protection against tetanus, diphtheria, and pertussis, which is important for kindergarten entry and general immunity.

Varicella exposure with Varizig (VariZIG) is post-exposure prophylaxis and does not replace vaccination for long-term immunity. Therefore, a plan to vaccinate with MMR, Varicella, and Tdap at this time best supports ongoing immunologic recovery and upcoming school requirements.