Funding statement:
Except Luxembourg, all the organisations involved have received funding from the European Centre for Disease Prevention and Control (ECDC) implementing Framework Contract ECDC/2021/018 ‘Vaccine effectiveness and impact of COVID-19 vaccines through routinely collected exposure and outcome using health registries’ (RS/2022/DTS/24104). Luxembourg participated to the project with no contribution.
Conflict of interest: Authors declare no support from any private organisation for the submitted work; no financial relationships with any organisations that might have an interest in the submitted work in the previous three years, no other relationships or activities that could appear to have influenced the submitted work.
Authors’ contributions: The common protocol, including the design of the statistical analysis, was elaborated by SM, IK, BN, AS, JS, MV, AN and NN, with active contributions from all other authors. All authors from institutions other than ISCIII and Epiconcept were in charge of performing site VE estimations, while authors from ISCIII and Epiconcept were in charge of pooling site estimates. IK and SM drafted the first version of the manuscript. VEBIS-Lot 4 working group members had supporting roles in study design and data management. All authors contributed to the interpretation of results and critically reviewed and approved the content of this manuscript.
VEBIS-Lot 4 working group: Bolette Søborg, Joris A.F. van Loenhout, Ausenda Machado, Palle Valentiner-Branth, Carlos Dias, Pierre Hubin, Itziar Casado, Aitziber Echeverría, Cristina Burgui, Amparo Larrauri, Esther Kissling, Marine Maurel, Liliana Antunes, Matylde Diouf