Is Vaccine Efficacy A Statistical Illusion?

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What would happen if we had delayed reporting of deaths by one week?

To evaluate the risk/benefit of a vaccine for treating a virus, such as covid-19, we can compare the all-cause mortality rate of vaccinated against unvaccinated people on a periodic basis. If the mortality rate for those vaccinated is consistently lower than that for unvaccinated then we might conclude the vaccine must be beneficial.