Question explored with the scientific record
Do vaccines save more lives than the deaths that cause
The short version: the evidence on whether vaccines save more lives than they cost is contradictory, and the studies that show a net benefit have design flaws that likely overstate it.
The question asks about all vaccines, but the evidence here is almost entirely about COVID-19 vaccines. That is a problem. The studies that claim a net survival benefit from COVID-19 vaccination share a critical weakness: they compare vaccinated people to unvaccinated people without fully controlling for the fact that healthier people are more likely to get vaccinated. The Norwegian study [2] found that fully vaccinated adults had about 60% lower all-cause mortality than unvaccinated. The Hungarian study [8] corrected for this "healthy vaccinee effect" and still found 49-75% lower mortality. But the Australian critique [1] shows that if you take those numbers literally, they imply an impossible 121% excess death rate in the unvaccinated. Something is wrong with the comparison.
Several studies point the other way. The UK ONS analysis [3] found that vaccinated individuals eventually had higher all-cause mortality than unvaccinated, with the crossover happening between September 2022 and January 2025 depending on age. The US county-level study [5] found that higher vaccination rates predicted higher excess mortality in 2022 and 2023. The European ecological study [10] found the same pattern across 31 countries. The nursing home study [11] found that elevated mortality after COVID-19 infection lasted longer in vaccinated residents (5 weeks) than in unvaccinated (1 week), which is the opposite of what you would expect if vaccination were protective.
The evidence for other vaccines is thinner. The influenza vaccine meta-analysis in diabetics [12] found a 46% reduction in all-cause mortality, but the heterogeneity was extreme (I²=96%), meaning the studies disagreed with each other. The maternal influenza and pertussis study [14] found reduced infant mortality, but it was observational and subject to the same healthy-user bias.
| Study | Population | Finding | Key limitation |
|---|---|---|---|
| Norway [2] | 4.6M adults | 58-61% lower mortality in vaccinated | Healthy vaccinee bias |
| Hungary [8] | 6.4M adults | 49-75% lower mortality after correction | Correction may be incomplete |
| Australia critique [1] | 65+ | Implied 121% excess in unvaccinated is impossible | Shows the bias is real |
| UK ONS [3] | England adults | Vaccinated mortality crosses above unvaccinated | Observational, residual confounding |
| US counties [5] | 3000+ counties | Higher vaccination = higher excess mortality | Ecological, cannot prove causation |
| Europe 31 countries [10] | 31 countries | Higher vaccination = higher 2022 mortality | Ecological, authors caution against causal interpretation |
| Nursing homes [11] | 15,022 facilities | Mortality lasts longer in vaccinated | Confounding by frailty |
My call: the evidence that any vaccine produces a net reduction in all-cause mortality is not reliable. The studies that claim benefit have not adequately controlled for the fact that healthier people get vaccinated. The studies that find harm are mostly ecological and cannot prove causation. For COVID-19 vaccines specifically, the most honest answer is that we do not know whether they save more lives than they cost, because the most informative study design (randomized trial with all-cause mortality as the endpoint) was never done.
Confidence: moderate that the evidence is insufficient to answer the question.
Sources used 9
-
The Claim That COVID-19 Vaccination Protected Australians from All-Cause Mortality Is Not Plausible
Liu et al.'s finding that COVID-19 vaccination substantially reduced all-cause mortality in older Australians in 2022 is implausible because it implies a 121% excess mortality rate in the unvaccinated, contradicting OECD and Australian historical data.
DOI: 10.71189/jim/2026/v02n03a11 -
COVID-19 mRNA vaccination and all-cause mortality in the adult population in Norway during 2021–2023: a population-based cohort study
In a Norwegian population-based cohort of 4,645,910 adults followed from January 2021 to December 2023, individuals who received three or more mRNA vaccine doses had a substantially lower adjusted all-cause mortality rate than unvaccinated individuals, with fully vaccinated adul…
DOI: 10.1136/bmjph-2024-001859 -
All-cause mortality according to COVID-19 vaccination status: An analysis of the UK office for National statistics public data
The analysis of UK ONS data from April 2021 to May 2023 found that all-cause and non-COVID-19 mortality SMRs increased over time for vaccinated individuals relative to unvaccinated individuals across all age groups, with predicted crossing points from September 2022 to January 2…
DOI: 10.12688/f1000research.154058.2 -
Why COVID-19 vaccination cannot be ruled out as an explanation for all-cause excess mortality in the pandemic’s aftermath: A population-level study of over 3,000 US counties with over 320 million people
A US county-level study found positive associations between per-capita COVID-19 vaccine uptake and all-cause excess mortality in 2022 and 2023, even when adjusting for lagged mortality, but the design cannot establish causation.
DOI: 10.12688/f1000research.177279.1 -
Effectiveness of COVID-19 Vaccination in Preventing All-Cause Mortality among Adults during the Third Wave of the Epidemic in Hungary: Nationwide Retrospective Cohort Study
In a nationwide retrospective cohort of 6.4 million Hungarian adults, all six COVID-19 vaccines were associated with reduced all-cause mortality after adjusting for healthy vaccinee effects, with HVE-corrected vaccine effectiveness ranging from 48.7% for Pfizer-BioNTech to 75.4%…
DOI: 10.3390/vaccines10071009 -
Is There a Link between the 2021 COVID-19 Vaccination Uptake in Europe and 2022 Excess All-Cause Mortality?
Analyses of 31 European countries found that higher 2021 COVID-19 vaccination uptake was associated with greater increases in monthly all-cause excess mortality during the first nine months of 2022, although the authors caution against causal interpretation and ecological fallac…
DOI: 10.21276/apjhs.2023.10.1.6 -
Temporal patterns of all-cause mortality among U.S. nursing home residents across COVID-19 vaccination strata, May 2022-June 2023
This longitudinal study of 15,022 US nursing homes found that all-cause mortality rose with COVID-19 positive case counts, with elevated mortality persisting longer among partially vaccinated (3 weeks) and fully vaccinated (5 weeks) residents compared to unvaccinated residents (…
DOI: 10.18103/mra.v14i3.7380 -
Impact of Influenza Vaccination on All-Cause Mortality and Hospitalization for Pneumonia in Adults and the Elderly with Diabetes: A Meta-Analysis of Observational Studies
A meta-analysis of six observational studies found that influenza vaccination in adults and elderly people with diabetes was associated with lower all-cause mortality (MH-OR 0.54, 95% CI 0.40-0.74) and lower hospitalization for pneumonia (MH-OR 0.89, 95% CI 0.80-0.98).
DOI: 10.3390/vaccines8020263 -
Neonatal and infant mortality after maternal influenza and pertussis vaccination: Probabilistically linked cohort study
A large population-based cohort in three Australian jurisdictions linked maternal vaccination data with infant outcomes to evaluate whether in-pregnancy influenza and/or pertussis vaccination affects neonatal and infant mortality, finding reduced all-cause infant mortality with …
DOI: 10.1080/21645515.2025.2587307