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New population-level data on the vaccination programme from the Czech Republic, collected from 2.2 million individual health records, have been analysed by Fürst et al and their analysis has been accepted for publication in the International Journal of Infectious Diseases (the pre-publication date on the article is May 20241). They analysed the all-cause mortality (ACM) of people vaccinated and unvaccinated against Covid-19 and found that ACM was consistently much lower in freshly vaccinated groups. Now in case you are thinking that this surely means the vaccines saved lives, it turns out that they found this pattern even outside of ‘pandemic’ waves (cold & flu season) and they concluded that this was explainable by the Healthy Vaccine Effect (HVE). And the effect of this bias was sufficiently large, that they further concluded that it leads to an overestimate of Covid-19 vaccine efficiency in observational studies.”