Who sends text messages in staggered time and space?

Big data will send you information according to your action trajectory, and the community will receive a notice and give you a yellow code. Those who are given the yellow code need to carry out self-health monitoring for 3 days (report any abnormality in time) and go to the designated institution for nucleic acid detection twice (with an interval of more than 24 hours). If the results are all negative, they can automatically turn into green codes. Meet the transcoding conditions, automatic transcoding failure, with relevant certificates to the local community (village), street (township) registration, for the yellow code to green code matters.