2024 Yes A multi-layered strategy for COVID-19 infection prophylaxis in schools: A review of the evidence for masks, distancing, and ventilation https://onlinelibrary.wiley.com/doi/10.1111/ina.13142 McLeod, Robert S. Europe Observational Teachers Staff Students Viruses Air purification Infraction prophylaxis in school classrooms Masking and physical distancing Mechanical ventilation Natural ventilation In-classroom teaching amid infectious SARS-CoV-2 variants requires layered protective measures. Needed measures depend on variant threat, community infection, and political acceptability. Consistent prophylaxis dramatically reduces infection risk in classrooms. 2022