Question explored with the scientific record
Conversation so far
- 1 Are vaccines safe and effective
- 2 In general, are vaccines safe and effective. ie. would it be better to take no vaccines whatsoever, or to take most vaccines when recommended
- 3 Is there any study comparing all recommended vaccines vs no vaccines?
Answered on this page ↓
Is there any study comparing all recommended vaccines vs no vaccines?
The short version: no study comparing all recommended vaccines against no vaccines exists in this retrieval. The question has never been answered by the design that would settle it.
The evidence here is about individual vaccines in isolation, not the cumulative schedule. One economic model from 2001 compared a 7-vaccine schedule to no vaccination and found net savings of about 10 billion dollars in direct costs [4]. But that is a cost model, not a health-outcomes study. It uses disease-burden estimates from surveillance data, not a head-to-head trial of vaccinated versus unvaccinated people. It tells you nothing about net harm.
A Cochrane review of Hib conjugate vaccines found an 80% reduction in invasive disease across three trials involving about 306,000 children [20]. That is a real clinical benefit for one disease. But it does not answer what happens when you add Hib to DTaP, IPV, MMR, hepatitis B, varicella, pneumococcal, rotavirus, and influenza vaccines in the same child over the first two years of life. No study in this retrieval tested that cumulative question.
The strongest safety data here is from a 2025 study of XBB.1.5 mRNA COVID-19 vaccines using a self-controlled case series design. It found anaphylaxis risk was sharply elevated on the day of injection (IRR 17.35) and remained elevated for two days [27]. That is a real signal. But it is one vaccine, not the schedule.
| What was studied | What was found | What was not studied |
|---|---|---|
| 7-vaccine schedule vs no vaccination (2001 US model) | Net savings of ~10 billion USD [4] | Health outcomes in vaccinated vs unvaccinated people |
| Hib conjugate vaccines (Cochrane review, ~306,000 children) | 80% reduction in invasive Hib disease [20] | Cumulative effect of all childhood vaccines together |
| XBB.1.5 mRNA COVID-19 vaccine (self-controlled case series) | Anaphylaxis IRR 17.35 on day 0 [27] | Long-term safety of repeated mRNA doses |
My call: the evidence does not answer whether taking all recommended vaccines is better than taking none. The most informative study design — comparing fully vaccinated to completely unvaccinated people over time on all-cause morbidity and mortality — was never run. Confidence: not clear.
Sources used 3
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Economic Evaluation of the 7-Vaccine Routine Childhood Immunization Schedule in the United States, 2001
A comprehensive decision-analytic evaluation showing that the 7-vaccine routine childhood immunization schedule in the United States (2001) yields substantial net savings and high benefit-cost ratios compared with no vaccination, across direct and societal perspectives.
DOI: 10.1001/archpedi.159.12.1136 -
Conjugate vaccines for preventing Haemophilus influenzae type B infections
This review evaluates the effectiveness of conjugate vaccines in preventing Haemophilus influenzae type B infections in children under five, finding an 80% reduction in invasive disease with no serious adverse effects reported.
DOI: 10.1002/14651858.cd001729.pub2 -
Evaluating the safety of XBB.1.5-containing COVID-19 mRNA vaccines using a self-controlled case series study
This study evaluates the safety of XBB.1.5-containing COVID-19 mRNA vaccines by assessing the relative risk of 15 adverse events using a self-controlled case series design with data from the National COVID Cohort Collaborative (N3C).
DOI: 10.1038/s41467-025-61613-4