Funding: This work was funded by the National Insitute for Heatlh Research (NIHR) (NIHR200908) and the Wellcome Trust (206250/Z/17/Z) (LACC, TWR, AJK). The work was partly supported by funding from the European Union's Horizon 2020 research and innovation programme - project EpiPose (101003688: RCB); the FCDO/Wellcome Trust (Epidemic Preparedness Coronavirus research programme 221303/Z/20/Z: KvZ); the Wellcome Trust (210758/Z/18/Z: SA); NIHR (NIHR200929) (NGD); UK MRC (MC_PC_19065) (NGD) and UKRI Research England (NGD). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Estimates of numbers of SARS-CoV-2 infections by country and age group over time, current proportions in different immune states, and potential remaining burden of hospitalisations and deaths for 19 European countries from article "Unexposed populations and potential COVID-19 burden in European countries as of 21st November 2021"