Chicago Public Schools cites progress in addressing ‘filthy buildings,’ vows more deep-cleaning over Thanksgiving break

A custodian mops a hallway at Vaughn Occupational High School, 4355 N Linder Ave., Friday, March 6, 2020, in Chicago. A Chicago Public Schools special education classroom assistant who works at the school has tested presumptively positive for COVID-19, or coronavirus. (John J. Kim/Chicago Tribune) (John J. Kim / Chicago Tribune)