Variation in SARS-CoV-2 seroprevalence across districts, schools and classes: baseline measurements from a cohort of primary and secondary school children in Switzerland

Objectives To determine the variation in SARS-CoV-2 seroprevalence in school children and the relationship with self-reported symptoms.Design Baseline measurements of a longitudinal cohort study (Ciao Corona) from June to July 2020.Setting 55 schools stratified by district in the canton of Zurich, S...

Full description

Bibliographic Details
Published in:	BMJ Open
Main Authors:	Sarah R Haile, Milo Alan Puhan, Anja Frei, Agne Ulyte, Christoph Berger, Susi Kriemler, Thomas Radtke, Michael Huber, Merle Schanz, Magdalena Schwarzmueller, Alexandra Trkola, Jan Fehr, Irene Alma Abela, Jacob Blankenberger, Ruedi Jung, Celine Capelli
Format:	Article
Language:	English
Published:	BMJ Publishing Group 2021-07-01
Online Access:	https://bmjopen.bmj.com/content/11/7/e047483.full

Similar Items

SARS-CoV-2 seroprevalence in children, parents and school personnel from June 2020 to April 2021: cohort study of 55 schools in Switzerland
by: Agne Ulyte, et al.
Published: (2022-06-01)

Evolution of SARS-CoV-2 seroprevalence and clusters in school children from June 2020 to April 2021: prospective cohort study Ciao Corona
by: Agne Ulyte, et al.
Published: (2021-11-01)

Heterogeneous evolution of SARS-CoV-2 seroprevalence in school-age children
by: Sarah R. Haile, et al.
Published: (2023-01-01)

Surveillance of Acute SARS-CoV-2 Infections in School Children and Point-Prevalence During a Time of High Community Transmission in Switzerland
by: Susi Kriemler, et al.
Published: (2021-03-01)

Prediction of Past SARS-CoV-2 Infections: A Prospective Cohort Study Among Swiss Schoolchildren
by: Jacob Blankenberger, et al.
Published: (2021-08-01)

Perceptions towards mask use in school children during the SARS-CoV-2 pandemic: descriptive results from the longitudinal Ciao Corona cohort study
by: Priska Ammann, et al.
Published: (2022-04-01)

Long COVID in children and adolescents: results from three cross-sectional school-based cohorts with adjudication
by: Alessia Raineri, et al.
Published: (2025-10-01)

Persistent humoral immune response in youth throughout the COVID-19 pandemic: prospective school-based cohort study
by: Alessia Raineri, et al.
Published: (2023-11-01)

Improving the Conduct of Health-Related Research in Schools
by: Alessia Raineri, et al.
Published: (2025-08-01)

Lifestyle Behaviours of Children and Adolescents During the First Two Waves of the COVID-19 Pandemic in Switzerland and Their Relation to Well-Being: An Observational Study
by: Gabriela P. Peralta, et al.
Published: (2022-09-01)

Updating national physical activity guidelines based on the global WHO guidelines: experiences and challenges from Switzerland
by: Sonja Kahlmeier, et al.
Published: (2023-09-01)

High SARS-CoV-2 seroprevalence but no severe course of COVID-19 disease among people on opioid agonist treatment in Zurich: a cross-sectional study
by: Philip Bruggmann, et al.
Published: (2022-01-01)

Health-Related Quality of Life and Adherence to Physical Activity and Screen Time Recommendations in Schoolchildren: Longitudinal Cohort Ciao Corona
by: Sarah R. Haile, et al.
Published: (2023-07-01)

Updating and Adapting Swiss Physical Activity Guidelines: A Journey Towards Alignment With the WHO Guidelines
by: Simon Endes, et al.
Published: (2024-06-01)

Cross-protective HCoV immunity reduces symptom development during SARS-CoV-2 infection
by: Irene A. Abela, et al.
Published: (2024-02-01)

Clinical practice guidelines of medical societies in Switzerland: analysis of the current state
by: Lukas Bachmann, et al.
Published: (2019-10-01)

An Unwanted but Long-Known Company: Post-Viral Symptoms in the Context of Past Pandemics in Switzerland (and Beyond)
by: Kaspar Staub, et al.
Published: (2024-04-01)

Taxation options for nicotine and tobacco products in Switzerland – a review of tax policies
by: Larissa Merz, et al.
Published: (2021-12-01)

Emerging Health Care Leaders: Lessons From a Novel Leadership and Community-Building Program
by: Andrea Martani, et al.
Published: (2024-04-01)

SARS-CoV-2 Quarantine Mandated by Contact Tracing: Burden and Infection Rate Among Close Contacts in Zurich, Switzerland, 2020–2021
by: Hélène Eloise Aschmann, et al.
Published: (2024-09-01)

Assessing the Value of T cell Monitoring in the General Population of Children and Adolescents – Insights From the Ciao Corona Cohort Study
by: Alessia Raineri, et al.
Published: (2025-09-01)

Longitudinal humoral and cell-mediated immune responses in a population-based cohort in Zurich, Switzerland between March and June 2022 - evidence for protection against Omicron SARS-CoV-2 infection by neutralizing antibodies and spike-specific T-cell responses
by: Kyra Denise Zens, et al.
Published: (2023-08-01)

Mental health burden of persons living in Ukraine and Ukrainians displaced to Switzerland: the mental health assessment of the Ukrainian population (MAP) studies
by: Anja Frei, et al.
Published: (2025-08-01)

A discrete choice experiment on price and flavour effects on the appeal of nicotine products: a pilot study among young adults in Switzerland
by: Larissa Merz, et al.
Published: (2023-03-01)

Small Area Variation of Adherence to Clinical Recommendations: An Example from Switzerland
by: Oliver Gruebner, et al.
Published: (2022-05-01)

Effects of a long-term home-based exercise training programme using minimal equipment vs. usual care in COPD patients: a study protocol for two multicentre randomised controlled trials (HOMEX-1 and HOMEX-2 trials)
by: Anja Frei, et al.
Published: (2019-03-01)

Predictors of work inability after acute myocardial infarction in Switzerland
by: Fabio Barresi, et al.
Published: (2024-06-01)

Digital Transformation of Vocational Schools in Switzerland: The Importance of Innovative School Management Behavior
by: Andreas Harder, et al.
Published: (2025-08-01)

Individual-Level Evaluation of the Exposure Notification Cascade in the SwissCovid Digital Proximity Tracing App: Observational Study
by: Tala Ballouz, et al.
Published: (2022-05-01)

Cross-sectional survey on hantavirus seroprevalence in Canton St. Gallen, Switzerland
by: S Bankoul, et al.
Published: (2007-01-01)

Continuous deep sedation until death in patients admitted to palliative care specialists and internists: a focus group study on conceptual understanding and administration in German-speaking Switzerland
by: Sarah Ziegler, et al.
Published: (2018-08-01)

Adverse effects, perceptions and attitudes related to BNT162b2, mRNA-1273 or JNJ-78436735 SARS-CoV-2 vaccines: Population-based cohort
by: Oliver Bürzle, et al.
Published: (2023-04-01)

Sources of Support and Their Benefits for New Primary School Teachers in Switzerland
by: Anja Winkler, et al.
Published: (2025-05-01)

Diverging Educational Aspirations Among Compulsory School-Leavers in Switzerland
by: Ackermann Tobias, et al.
Published: (2023-07-01)

Measuring school children’s attitudes toward immigrants in Switzerland and Poland
by: Charlotte Clara Becker, et al.
Published: (2020-11-01)

Tick-borne encephalitis virus seroprevalence and infection incidence in Switzerland, 2020–2021
by: Arthur Brêchet, et al.
Published: (2025-03-01)

Assessing the German vocabulary size of elementary school students in Graubünden, Switzerland
by: Dominique Caglia, et al.
Published: (2025-10-01)

Transition to Long-Term Baccalaureate School in Switzerland: Governance, Tensions, and Justifications
by: Sandra Hafner, et al.
Published: (2022-01-01)

Adolescents’ School Burnout: A Comparative Study between Italy and Switzerland
by: Piera Gabola, et al.
Published: (2021-08-01)

Correction to: Measuring school children’s attitudes toward immigrants in Switzerland and Poland
by: Charlotte Clara Becker, et al.
Published: (2021-04-01)