​​ Risk of infection, hospitalisation, and death up to 9 mont | UPDATES IN MEDICINE

​​ Risk of infection, hospitalisation, and death up to 9 months after a second dose of COVID-19 vaccine:
a retrospective, total population cohort study in Sweden


● Interpretation - We found progressively waning vaccine effectiveness against SARS-CoV-2 infection of any severity across all subgroups, but the rate of waning differed according to vaccine type. With respect to severe COVID-19, vaccine effectiveness seemed to be better maintained, although some waning became evident after 4 months. The results strengthen the evidence-based rationale for administration of a third vaccine dose as a booster.


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