Why are we talking about vaccines???

The evidence on whether vaccines reduce or increase all-cause mortality is contradictory and depends heavily on study design, population, and time frame.

The Norwegian study [1] and the Hungarian study [4] both report that vaccinated people had roughly half the all-cause mortality of unvaccinated people. The Hungarian study explicitly adjusted for the "healthy vaccinee effect" — the fact that healthier people are more likely to get vaccinated — and still found a benefit [4]. The Norwegian study also adjusted for medical risk groups [1].

But several other studies find the opposite pattern. A UK analysis of ONS data found that vaccinated individuals initially had lower mortality, but the trend reversed over time, and by late 2022 or 2023 the vaccinated groups had higher all-cause mortality than the unvaccinated [2]. A US county-level study found that higher vaccination rates were associated with more excess mortality in 2022 and 2023, not less [3]. A separate US ecological analysis estimated 130,000 to 180,000 vaccine-attributed deaths from February to August 2021 [5]. A European ecological study found that higher 2021 vaccination uptake predicted larger increases in 2022 monthly mortality [6].

The key difference between the studies that show benefit and those that show harm is the time window. The "benefit" studies mostly cover 2021, when COVID-19 was a major cause of death and the unvaccinated were at highest risk. The "harm" studies cover 2022 and 2023, when COVID-19 was less deadly and the vaccinated groups had received multiple doses. The Norwegian study [1] covers 2021-2023 and still shows benefit, but it is a single study from a single country with a specific vaccination schedule.

The evidence is not clear on whether COVID-19 vaccination reduces or increases all-cause mortality over the long term. The early benefit during the pandemic's acute phase is plausible. The later signal of harm in multiple ecological and observational studies is also plausible and cannot be dismissed as mere confounding. The question cannot be settled by the current evidence because the most informative study design — a randomized trial comparing vaccinated to unvaccinated over several years — was never run.

My call: the evidence is contradictory and insufficient to conclude that COVID-19 vaccination reduces all-cause mortality over the long term. Confidence: low.