Can we give MMR vaccination and chickenpox vaccination after 6 months of age of the child who has to be taken for liver transplantation
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MMR varicella vaccination pre-transplant pediatric liver
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MMR varicella vaccination pre liver transplant 6 months age infant guidelines ACIP IDSA
I now have comprehensive, authoritative data from the IDSA 2013 guidelines, Harriet Lane, and the SickKids pre-transplant guidelines. Here is the complete, detailed answer:
MMR and Varicella (Chickenpox) Vaccination in a Child <12 Months Going for Liver Transplantation
This is a critically important pre-transplant immunization question. The key principles and specific guidance are below.
Core Principle: Vaccinate BEFORE Transplant
Live-attenuated vaccines (MMR and varicella) are contraindicated after solid organ transplantation due to immunosuppression. Therefore, the only window to give these vaccines is before transplantation. Vaccination must not be withheld because of concern about causing transplant rejection - evidence consistently shows no increased rejection risk.
- Harriet Lane Handbook, 23rd ed., p. 566 - eTABLE 16.3
- Brenner and Rector's The Kidney, p. 3002
Age 6-11 Months: Can You Give MMR and Varicella?
Yes - both may be given at 6-11 months of age, but with important caveats:
MMR at 6-11 months (Pre-transplant)
Per the 2013 IDSA Clinical Practice Guideline for Vaccination of the Immunocompromised Host (Recommendation 95):
"SOT candidates aged 6-11 months can receive MMR vaccine if they are not receiving immunosuppression and if transplantation is not anticipated within 4 weeks (weak recommendation, very low evidence). If transplantation is delayed (and the child is not receiving immunosuppression), the MMR vaccine should be repeated at 12 months (strong, moderate)."
Key rules:
- Child must not be receiving immunosuppression
- Transplant must not be planned within the next 4 weeks
- A dose given before 12 months of age does NOT count toward the standard 2-dose MMR series - it must be repeated at 12 months (and again if transplant is further delayed)
- If first dose given at <12 months, 2 additional doses of measles-containing vaccine are required after the child turns 12 months old (SickKids Pre-transplant Guidelines 2024)
Varicella at 6-11 months (Pre-transplant)
Per IDSA Recommendation 96:
"The varicella vaccine (VAR) can be administered to varicella-naive SOT candidates aged 6-11 months who are not immunosuppressed, provided the timing is ≥4 weeks prior to transplant (weak recommendation, very low evidence). Optimally, 2 doses should be administered ≥3 months apart (strong, low)."
Post-Transplant: What Can Be Given?
Once the child has received a liver transplant, MMR and varicella are:
| Vaccine | Post-Transplant |
|---|---|
| MMR | Contraindicated |
| MMRV | Contraindicated |
| Varicella | Contraindicated (except narrow exception below) |
| LAIV (intranasal flu) | Contraindicated |
| Inactivated vaccines (DTaP, HepA, HepB, IPV, etc.) | Routine schedule, starting 2-6 months post-transplant |
Narrow exception for varicella post-transplant (IDSA Rec. 103): Varicella may be considered in non-immune children who are renal or liver transplant recipients receiving minimal or no immunosuppression and with no recent graft rejection - this is a weak recommendation.
Summary: What to Do for a 6-Month-Old Pre-Liver Transplant Child
| Situation | Action |
|---|---|
| Child is NOT immunosuppressed + transplant NOT within 4 weeks | Give both MMR and varicella now (at 6 months) |
| Child IS currently on immunosuppression | Do not give MMR or varicella |
| Transplant expected within <4 weeks | Do not give MMR or varicella (insufficient time for immune response + safety window) |
| If dose given at 6 months and transplant is delayed past 12 months | Repeat MMR at 12 months (the 6-month dose does not count toward the primary series) |
| For varicella: give 2 doses ≥3 months apart if time allows | Optimal protection requires 2 doses |
Key Practical Points
- Timing is the most critical factor - a minimum 4-week gap between live vaccine administration and transplant is required.
- Both vaccines can be given simultaneously at the same visit (different sites), since giving them concurrently is preferred over separating them, which would require a 4-week interval between live vaccines.
- Doses of MMR given before 12 months do not confer long-lasting immunity and must be repeated at 12 months regardless of transplant timing.
- Serologic testing post-vaccination (to confirm seroconversion) is recommended before transplant if time allows.
- Household and close contacts of the transplanted child should maintain up-to-date vaccination (including MMR and varicella) for herd protection.
Sources:
- The Harriet Lane Handbook, 23rd ed. - eTABLE 16.3 (Vaccinations After Solid Organ Transplant), p. 565-566
- Brenner and Rector's The Kidney - Immunization in Kidney Transplant Recipients
- National Kidney Foundation Primer on Kidney Diseases, 8th ed. - Infectious Disease Prevention Strategies
- 2013 IDSA Clinical Practice Guideline for Vaccination of the Immunocompromised Host (Recommendations 95, 96, 103)
- SickKids Pre-Transplant Immunization Guidelines 2024
- Hartley C et al. (2024). Live-Attenuated Vaccines in Pediatric Solid Organ Transplant. Vaccines, 12(4):376. PMID: 38675758
If transplantation is still pending so can I give the second those of chickenpox vaccine after 3 months of first dosage that is first dosage at 6 month and second dosage at 9 months of age
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varicella vaccine second dose 9 months pre-transplant infant IDSA 6 months first dose interval
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varicella second dose 6 months 9 months pretransplant infant interval
Now I have everything needed for a precise, complete answer. Here it is:
Can the 2nd Varicella Dose Be Given at 9 Months (3 Months After 1st Dose at 6 Months)?
Short answer: Yes, provided transplantation is still pending, the child is not on immunosuppression, and the transplant is not expected within 4 weeks of the second dose. However, there are important caveats you must be aware of.
What the Guidelines Say
The 2013 IDSA Guideline (Recommendation 96) explicitly states:
"The VAR can be administered to varicella-naive SOT candidates aged 6-11 months who are not immunosuppressed, provided the timing is ≥4 weeks prior to transplant. Optimally, 2 doses should be administered ≥3 months apart." (Strong, low evidence)
So: 1st dose at 6 months → 2nd dose at 9 months fulfills the ≥3 month interval requirement. This is the recommended approach when transplant remains pending.
Critical Conditions That Must ALL Be Met for the 2nd Dose at 9 Months
| Condition | Requirement |
|---|---|
| Child's immune status | NOT receiving immunosuppression at time of 2nd dose |
| Transplant timing | NOT expected within 4 weeks of the 2nd dose |
| Child's age at 2nd dose | 9 months - still within the 6-11 month window |
| Interval from 1st dose | ≥3 months - satisfied (6 months to 9 months = 3 months) |
If all four conditions are met - yes, give the 2nd dose at 9 months.
What Happens After the 2nd Dose at 9 Months?
This is where it gets important - the story does not end at 9 months:
-
Check serology 4-6 weeks after the 2nd dose to confirm seroconversion (protective VZV antibody titer). This is recommended by SickKids Pre-Transplant Guidelines 2024 and is good practice before proceeding to transplant.
-
Both doses given below 12 months of age do NOT confer long-lasting protective immunity. Per standard immunization science, varicella vaccine response is suboptimal before 12 months due to immature immune function and potential interference from maternal antibodies.
-
If the transplant is further delayed and the child reaches 12 months of age, the varicella series needs to be reassessed - ideally a dose should be given at 12 months (the minimum standard age for durable varicella immunization), at least 3 months after the 9-month dose.
-
These pre-transplant doses below 12 months serve as emergency pre-transplant protection only - they are not equivalent to the standard 2-dose schedule starting at 12 months.
Regarding the MMR at the Same Time
Since MMR was also given at 6 months (as discussed previously), the same logic applies:
- MMR given at 6 months must be repeated at 12 months (even if transplant has not happened yet), as the 6-month MMR dose does not count toward the durable series.
- The 9-month visit is a good opportunity to reassess MMR status, but a second MMR dose at 9 months is not routinely indicated - wait for 12 months for the repeat MMR.
Practical Timeline Summary
| Age | Action |
|---|---|
| 6 months | 1st dose varicella + MMR (if not immunosuppressed + transplant >4 weeks away) |
| 9 months | 2nd dose varicella (≥3 months after 1st dose; only if transplant still pending + not immunosuppressed + transplant >4 weeks away) |
| 9-10 months (4-6 weeks after 2nd dose) | Check VZV serology to confirm seroconversion |
| 12 months | Repeat MMR (mandatory - 6-month dose does not count). Consider varicella booster also at 12 months if transplant still pending (≥3 months after 9-month dose) |
| Before any transplant date | Ensure last live vaccine was given ≥4 weeks prior |
Bottom line: Giving the 2nd varicella dose at 9 months is appropriate and follows IDSA guidance, as long as the child is not immunosuppressed and transplant is not imminent. The goal is to maximize immune protection in the narrow pre-transplant window, knowing that doses given before 12 months provide some but not fully durable protection.
- 2013 IDSA Clinical Practice Guideline for Vaccination of the Immunocompromised Host, Recommendation 96
- SickKids Pre-Transplant Immunization Guidelines 2024, Section 3.2
- The Harriet Lane Handbook, 23rd ed., p. 565-566
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