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Comparative complete scheme and booster effectiveness of COVID‐19 vaccines in p...

Kislaya, Irina; Peralta‐Santos, André; Borges, Vítor; Vieira, Luís; Sousa, Carlos; Ferreira, Bibiana; Pelerito, Ana; Gomes, João Paulo

Background: Information on vaccine effectiveness in a context of novel variants of concern (VOC) emergence is of key importance to inform public health policies. This study aimed to estimate a measure of comparative vaccine effectiveness between Omicron (BA.1) and Delta (B.1.617.2 and sub-lineages) VOC according to vaccination exposure (primary or booster). Methods: We developed a case-case study using data on ...


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