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Student close contact behavior and COVID-19 transmission in China's classrooms.
Guo, Yong; Dou, Zhiyang; Zhang, Nan; Liu, Xiyue; Su, Boni; Li, Yuguo; Zhang, Yinping.
Afiliação
  • Guo Y; Department of Building Science, Tsinghua University, Beijing 100084, China.
  • Dou Z; Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing 100084, China.
  • Zhang N; Department of Computer Science, The University of Hong Kong, Beijing 999077, China.
  • Liu X; Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing 100124, China.
  • Su B; Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing 100124, China.
  • Li Y; Clean Energy Research Institute, China Electric Power Planning and Engineering Institute, Beijing 100120, China.
  • Zhang Y; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR 999077, China.
PNAS Nexus ; 2(5): pgad142, 2023 May.
Article em En | MEDLINE | ID: mdl-37228510
Classrooms are high-risk indoor environments, so analysis of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission in classrooms is important for determining optimal interventions. Due to the absence of human behavior data, it is challenging to accurately determine virus exposure in classrooms. A wearable device for close contact behavior detection was developed, and we recorded >250,000 data points of close contact behaviors of students from grades 1 to 12. Combined with a survey on students' behaviors, we analyzed virus transmission in classrooms. Close contact rates for students were 37 ± 11% during classes and 48 ± 13% during breaks. Students in lower grades had higher close contact rates and virus transmission potential. The long-range airborne transmission route is dominant, accounting for 90 ± 3.6% and 75 ± 7.7% with and without mask wearing, respectively. During breaks, the short-range airborne route became more important, contributing 48 ± 3.1% in grades 1 to 9 (without wearing masks). Ventilation alone cannot always meet the demands of COVID-19 control; 30 m3/h/person is suggested as the threshold outdoor air ventilation rate in a classroom. This study provides scientific support for COVID-19 prevention and control in classrooms, and our proposed human behavior detection and analysis methods offer a powerful tool to understand virus transmission characteristics and can be employed in various indoor environments.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: PNAS Nexus Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: PNAS Nexus Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China