https://www.mercurynews.com/2022/01/04/covid-tests-find-hundreds-of-bay-area-students-infected-before-return-to-class/

As thousands of kids around the Bay Area return to class this week following a winter break marred by the coronavirus, COVID-19 tests that schools provided over the holidays are turning up hundreds of infections among Bay Area students and teachers — and keeping them from bringing the virus back to campus.

San Jose Unified School District students lined up for PCR tests and headed back to classrooms Tuesday, while school administrators in Oakland and Berkeley, where kids returned the day before, touted the success of rapid at-home tests that prevented hundreds of students and teachers from coming to school sick on Monday.