If your code turns yellow, you should isolate it. Some of them are isolated in designated hotels at their own expense. Some manage the streets in the community and are isolated at home. Now, if you travel, you need a nucleic acid report within 48 hours. If the travel code is green, there is no need for isolation. However, if you come back from an epidemic area, you need to be quarantined. The specific time is decided by the local government.