Figure 1

Illustrations depicting the number of decedents for death certificate assessment and study participants for seroprevalence survey. (a) Between March and October 2020, a total of 104 inhabitants of the studied community died, according to information we obtained from the state office for information and technology in North Rhine-Westphalia (Germany). The death certificates of 77 subjects were screened for information about gender, date of birth, date of death, COD, comorbidities, and history of SARS-CoV-2 infection. (b) Enrollment and flow of participants through the study as well as experimental procedures. In total 919 study participants from our previous 7-day seroepidemiological observational study²¹ were asked again to participate in at least one of the three follow-up visits (October 2020, January 2021, and April 2021). The only inclusion criterion was enrollment and sampling in our previous study (April 2020). Illustrations were created with bioRender.com premium (publication license available).