FILE - In this Jan. 23, 2019, file photo, students return to school at the Miguel Contreras Learning Complex High School downtown Los Angeles. Surging coronavirus cases in California prompted a warning on Wednesday, July 8, 2020, from the nation's most populous county of a possible delay to classroom instruction in public schools next month. Los Angeles County public health officials say, on average, more than 10% of people tested for the virus end up having it, a rate not seen since late-April. Given the high number of cases, Los Angeles County Public Health Director Barbara Ferrer said local school officials should prepare for delaying a return classroom instruction. (AP Photo/Richard Vogel, File)