Adequate vaccine effectiveness response

NW Nana Wu
KJ Keven Joyal-Desmarais
PR Paula A B Ribeiro
AV Ariany Marques Vieira
JS Jovana Stojanovic
CS Comfort Sanuade
DY Doro Yip
SB Simon L Bacon
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WHO have created a definition for adequate COVID-19 vaccine effectiveness,3 in which the vaccine effectiveness against symptomatic infections should be at least 70% with a lower 95% CI of at least 50%, and the vaccine effectiveness against hospitalisations or mortality should be at least 90% with a lower 95% CI of at least 70%. In this systematic review, we assessed results in terms of statistically significant reductions in vaccine effectiveness from baseline and meeting these WHO criteria.

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