Systematic reviewindependent cross-checkabstract checked I-SRC-125 standard review
Safety of routine childhood vaccines
Safety of vaccines used for routine immunization of U.S. children: a systematic review.
Overview
Maglione MA et al.. Pediatrics 2014 · PMID 25086160 · DOI 10.1542/peds.2014-1079
Some vaccines have rare serious side effects (e.g. febrile seizures after MMR); these are very rare compared with the benefits.
Does the study support the specific claim? Partly · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Review vaccine side effects
- How was the study done?
Systematic review
- How many people, animals or samples were studied?
67 studies
- What was actually found?
Rare serious effects for some vaccines; no autism link
- How large was the observed effect?
Not pooled
- What do the results mean in everyday life?
Side effects exist but are rare
- What are the study's limitations?
No pooling
- What does it say about Elawady's specific claim?
Supports caution, not a ban
- Do the results apply to Germany and Europe?
High
- What can explicitly not be concluded from this study?
Exact absolute risks
Scientific in-depth review
1. Full reference
- Authors
- Maglione MA et al.
- Journal
- Pediatrics
- Year
- 2014
- Identifier
- PMID 25086160 DOI 10.1542/peds.2014-1079
- Verification
- verified – PubMed efetch 2026-10-26; Crossref works record checked
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
Not stated in abstract (AHRQ-funded review series).
2. Research question
Which adverse events are associated with routine childhood vaccines used in the US?
3. Study design and population
- Study design
- Systematic review – Systematic review of controlled active-surveillance studies (AHRQ-type review)
- Population
Children receiving routine vaccines
- Country
USA (studies international)
- Period
Literature to about 2013
- Sample size
67 included studies
- Inclusion and exclusion criteria
Active surveillance with control mechanism
4. Methods and endpoints
- Exposure / intervention
Routine childhood vaccines
- Comparator
Unvaccinated/controls
- Endpoints
Adverse events
- Statistical methods
Narrative synthesis; strength of evidence grading
5. Actual results
- Results
High strength of evidence for MMR and febrile seizures; varicella vaccine associated with complications in immunodeficient individuals; moderate evidence that rotavirus vaccines are associated with intussusception; strong evidence that MMR is not associated with autism.
- Absolute risks
Not reported in abstract; events described as extremely rare.
- Authors' conclusion
Some vaccines are associated with serious adverse events, but these are extremely rare and must be weighed against the protective benefits.
6. Strengths
- Systematic, controlled studies only
7. Weaknesses
- No pooling
- US formulations only
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
No meta-analysis; adverse-event reporting inconsistent.
9. Assessment of the statistical interpretation
Qualitative strength-of-evidence ratings.
10. Relevance to the specific claim
Honest 'supporting' side: vaccines do have real, rare serious adverse events (febrile seizures, intussusception, complications in immunodeficiency). This justifies individual contraindication checks, not a ban.
11. Independent contrary findings
I-INTB-15, I-INTB-16, I-SRC-104, I-SRC-105 (large benefits).
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Balanced evidence on harms.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- There are to be no vaccinations: vaccinations, medicines and herbs are forbidden. – Studies with mixed or unclear results