Impacts of K-12 school reopening on the COVID-19 epidemic in Indiana, USA
In the United States, schools closed in March 2020 due to COVID-19 and have begun reopening as of August 2020, despite continuing transmission of SARS-CoV-2. To determine the impact of school reopening with varying levels of operating capacity and face-mask adherence, we used an agent-based model calibrated to and validated against multiple data types from the state of Indiana, USA. In our model, transmission can occur in schools, workplaces, community settings, and households, all of which are structured in a realistic way according to state geography and demography. Using this model, we quantified the burden of COVID-19 on K-12 students, teachers, their families, and the general population under alternative scenarios about school reopening. In our primary analysis, we considered three levels of school operating capacity (50%, 75%, and 100%) and three assumptions about face-mask adherence in schools (50%, 75%, and 100%). Under a scenario in which schools operate remotely, we projected 45,579 (95% CrI: 14,109-132,546) infections and 790 (95% CrI: 176-1680) deaths between August 24 and December 31. Reopening at 100% capacity with 50% face-mask adherence in schools resulted in a proportional increase of 42.9 (95% CrI: 41.3-44.3) times that number of infections and 9.2 (95% CrI: 8.9-9.5) times that number of deaths. In contrast, operating at 50% capacity with 100% face-mask adherence resulted in only an 11% (95% CrI: 5%-18%) increase in the number of infections compared to the scenario in which schools operate remotely. We conclude that reduced capacity and high face-mask adherence in schools substantially reduce the burden of COVID-19, both among those with direct ties to schools and across the state. As Indiana and other states proceed with school reopening, our results illustrate quantitatively the benefits of safety measures that schools are undertaking, underscoring their value for both schools and their communities.