If you are a fellow traveler, even if it is not a close or secondary close, it is best to self-isolate for good, it is not yet completely sure, only close or secondary close will be at risk, in fact, people in the same industry have risks, but the risk level is different, if your immunity is low is very likely to be caught, for their own safety, but also for the safety of colleagues and family members, I suggest you isolate yourself, and if you're okay for two weeks, you can go back to work.
According to peer close self-inspection, it is safe, not close. I think we need quarantine! Because you have been in contact with a close contact, although not a close contact, the phase code is classified as a secondary contact. Although the test came back negative. I think, for the sake of safety or quarantine is better! In case of an asymptomatic infection. Cause the spread of the epidemic, must be just in case or quarantine!