1. SARS-CoV-2 Seroprevalence in a Berlin Kindergarten Environment: A Cross-Sectional Study, September 2021.
- Author
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Bernhard, Julian, Theuring, Stefanie, van Loon, Welmoed, Mall, Marcus A., Seybold, Joachim, Kurth, Tobias, Rubio-Acero, Raquel, Wieser, Andreas, and Mockenhaupt, Frank P.
- Subjects
SCHOOL environment ,CROSS-sectional method ,IMMUNIZATION ,RESEARCH funding ,STATISTICAL sampling ,INTERVIEWING ,BLOOD collection ,IMMUNOGLOBULINS ,QUESTIONNAIRES ,DESCRIPTIVE statistics ,COLLEGE teachers ,FAMILIES ,ODDS ratio ,RESEARCH ,MEDICAL masks ,SEROPREVALENCE ,DATA analysis software ,CONFIDENCE intervals ,COVID-19 ,CHILDREN - Abstract
SARS-CoV-2 serology may be helpful to retrospectively understand infection dynamics in specific settings including kindergartens. We assessed SARS-CoV-2 seroprevalence in individuals connected to kindergartens in Berlin, Germany in September 2021. Children, staff, and household members from 12 randomly selected kindergartens were interviewed on COVID-19 history and sociodemographic parameters. Blood samples were collected on filter paper. SARS-CoV-2 anti-S and anti-N antibodies were assessed using Roche Elecsys. We assessed seroprevalence and the proportion of so far unrecognized SARS-CoV-2 infections. We included 277 participants, comprising 48 (17.3%) kindergarten children, 37 (13.4%) staff, and 192 (69.3%) household members. SARS-CoV-2 antibodies were present in 65.0%, and 52.7% of all participants were vaccinated. Evidence of previous infection was observed in 16.7% of kindergarten children, 16.2% of staff, and 10.4% of household members. Undiagnosed infections were observed in 12.5%, 5.4%, and 3.6%, respectively. Preceding infections were associated with facemask neglect. In conclusion, two-thirds of our cohort were SARS-CoV-2 seroreactive in September 2021, largely as a result of vaccination in adults. Kindergarten children showed the highest proportion of non-vaccine-induced seropositivity and an increased proportion of previously unrecognized SARS-CoV-2 infection. Silent infections in pre-school children need to be considered when interpreting SARS-CoV-2 infections in the kindergarten context. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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