From the brief: "Like many other counties in California, San Diego County closed its schools in March 2020 during the state’s first wave of COVID-19 cases. But, unlike many counties in California, San Diego County was able to support school reopening in many of its districts beginning in the summer of 2020. Though the county suffered among the highest number of COVID-19 cases per capita in the nation, it nonetheless was able to move swiftly to reopen schools. By May 2021, 98% of school districts in San Diego County were providing hybrid or full-time in-person learning for a total of 55% of the county’s public, non-charter school students. One district, Cajon Valley Union School District, has been open since September 8, 2020, and was the largest California school district to reopen beginning in fall 2020. Since reopening, the district has reported only three suspected cases of in-school transmission. This brief describes how San Diego County and Cajon Valley Union School District have been able to reopen schools."