Question explored with the scientific record
Conversation so far
- 1 can baby vaccines make you ill from the 1950s
- 2 can baby vaccines make you ill in adulthood vaccines from the 1950s
- 3 What are the known long-term risks (e.g., decades later) by vaccine type?
Answered on this page ↓
What are the known long-term risks (e.g., decades later) by vaccine type?
The short version: the record here shows short-term harms for some vaccine types, but almost nothing that tracks children for decades. The long-term question is largely unanswered.
The retrieved studies are almost entirely short-window safety and immunogenicity work. MMR's known reaction is early: about 18 in 100 toddlers had fever, diarrhea, or rash after dose one, resolving in days [1]. MMR-linked low platelets (ITP) is rare and self-limited, with country rates ranging from under 1 to about 4 per 100,000 [2]. DTP's signal is different and more troubling: in Guinea-Bissau, vaccinated children aged 6-35 months died at roughly twice the rate of unvaccinated ones [3], and a meta-analysis found higher mortality in girls than boys after DTP [4]. A 1990 cohort of 38,171 children found no rise in seizures or encephalopathy in the weeks after DTP [5]. Oral polio carries a real, documented long-term risk: the vaccine virus can revert and cause paralysis, and in rare immunodeficient people it sheds for years [6].
| Vaccine | Documented harm | Time frame |
|---|---|---|
| MMR | Fever/rash/diarrhea ~18% [1]; ITP rare [2] | Days to weeks |
| DTP | Higher child mortality in Guinea-Bissau [3]; female excess [4] | Months |
| OPV | Reversion to paralytic virus [6]; years-long shedding [6] | Years |
None of these records follows a cohort into middle age. The DTP mortality findings are the closest thing to a long-term signal, and they are observational, from one region, and contested. The vaccinated-versus-unvaccinated comparison over decades is simply not in this evidence.
My call: for MMR the documented risks are short-term and rare; for DTP and OPV the signals are more serious but still not decades-long follow-up. Confidence: low, because the long-term data is not here.
Sources used 6
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Evaluation of Potentially Common Adverse Events Associated With the First and Second Doses of Measles-Mumps-Rubella Vaccine
Among 535 toddlers, MMR1 was associated with fever, diarrhea, or rash in an estimated 18%; among 633 kindergarteners and 632 middle schoolers, MMR2 produced no significant symptom increases.
DOI: 10.1542/peds.2006-0678 -
Thrombocytopenic Purpura after Measles-Mumps-Rubella Vaccination: A Systematic Review of the Literature and Guidance for Management
This systematic review investigates the incidence of immune thrombocytopenic purpura (ITP) following measles-mumps-rubella (MMR) vaccination, comparing it to natural infections, and concludes that MMR-associated ITP is rare, self-limited, and non-life threatening.
DOI: 10.1016/j.jpeds.2009.10.015 -
Evidence of Increase in Mortality After the Introduction of Diphtheria–Tetanus–Pertussis Vaccine to Children Aged 6–35 Months in Guinea-Bissau: A Time for Reflection?
This study investigates the unexpected increase in mortality associated with the Diphtheria-Tetanus-Pertussis (DTP) vaccine among children aged 6-35 months in Guinea-Bissau, revealing a twofold higher mortality rate in vaccinated children compared to unvaccinated ones.
DOI: 10.3389/fpubh.2018.00079 -
Is diphtheria-tetanus-pertussis (DTP) associated with increased female mortality? A meta-analysis testing the hypotheses of sex-differential non-specific effects of DTP vaccine
This meta-analysis investigates the association between diphtheria-tetanus-pertussis (DTP) vaccination and increased female mortality, confirming that DTP vaccination is linked to significantly higher mortality rates in girls compared to boys and in DTP-vaccinated girls compared…
DOI: 10.1093/trstmh/trw073 -
Risk of Seizures and Encephalopathy After Immunization With the Diphtheria-Tetanus-Pertussis Vaccine
A population-based cohort study of 38,171 Tennessee Medicaid children examined the risk of seizures and encephalopathy after diphtheria-tetanus-pertussis (DTP) vaccination, finding no significant increase in febrile, afebrile, or acute symptomatic seizures in the first weeks pos…
DOI: 10.1001/jama.1990.03440120063038 -
VACCINE-DERIVED POLIOVIRUSES AND THE ENDGAME STRATEGY FOR GLOBAL POLIO ERADICATION
Genetically unstable oral poliovirus vaccine can revert to neurovirulent vaccine-derived polioviruses causing paralytic disease and outbreaks, reshaping the WHO polio eradication endgame.
DOI: 10.1146/annurev.micro.58.030603.123625