A coworker tested positive for Covid on Sunday. He also says he developed symptoms on Sunday. He was in his office with several unmasked people (including himself) for 30 minutes on Thursday, three days before he tested positive or got symptoms. Do the others that were in his office need to get tested? And if so, can anyone send me the CDC guideline(s) that says so? My boss won't take your word for it, but they will hopefully take the CDC's word.