Montgomery County health officials have looked into about 35 potential coronavirus-related cases at private and parochial schools. Fifteen of the school investigations involved positive test results,

...Kelly Branaman, superintendent of schools for the Archdiocese of Washington, said each of the system’s 54 parish schools created its own reopening plan based on parent interest in returning to campus, building capacity and configuration, and student enrollment...

https://www.washingtonpost.com/road-to-recovery/masks-thermometers-and-class-cohorts-students-return-to-campus/2020/09/21/a48312b4-fc0f-11ea-8d05-9beaaa91c71f_story.html#comments-wrapper