How long has Tieling been silent?

According to relevant information, the epidemic situation in Tieling was silent for seven days. Because Tieling City Epidemic Prevention and Control Center issued a notice that Tieling Town entered a silent state and was closed for seven days, all the staff did three nucleic acid tests to curb the epidemic as soon as possible. "Silent period" means that the returned workers shall not have any contact with the original employees of the enterprise within 48 hours. At the same time, do a good job in environmental disinfection, and divide different areas into different risk levels for personalized management.