Transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in day care centres – Lessons learned from a prospective analysis of outbreaks in Germany

Abstract

Abstract Background The role of children for the transmission of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is still unclear. The aim of our case-ascertained study is to examine transmission dynamics of SARS-CoV-2 among children and staff based on outbreaks in day care centres in Germany. Methods Based on day care centres with at least one reported case of SARS-CoV-2 we include 1-6-year-old children and staff of the affected group in the day care centre as well as their respective households. We test each study participant on acute and past SARS-CoV-2 infection with innovative child friendly tests and collect data on sociodemographics and symptoms. At four further measurement points within 12 days, the participants carry out the tests on SARS-CoV-2 by themselves. From October 2020 to May 2021, 25 day care centres with SARS-CoV-2 outbreaks participated and we included n = 244 children 1-6 years and n = 72 staff members in the study. Results First analyses from 25 outbreaks showed that the observed infection events in the examined day care centres were very different. Often, no or only few transmissions were found among the participants in the day care group, but in one day care centre, 13 people were infected: Between 0% and 81% of close contact persons in the day care centres were tested positive for SARS-CoV-2 in the study period. Children showed a similar percentage of secondary SARS-CoV-2 infections compared to adults (both 11%). Conclusions The study has been successful in detecting previously undetected infections of SARS-CoV-2 in day care centres. Results of these outbreaks examinations are presented regularly in public reports to inform public health decision-makers. By studying individual day care centre-related infection dynamics the data supplement the information from national reporting data.