Theoretically, the incubation period of COVID-19 is 14 days. If no new cases occur after 14 days, it can be unsealed.
So whether to unseal it depends on the specific situation.
Because the incubation period in COVID-19 is 7- 14 days, people think that the village closure will end after 14 days, but this is not the case. The village is still closed, and the management of villagers' access is stricter than before. Because there are always sporadic cases.
For unsealing, generally speaking, if no COVID-19 positive cases or asymptomatic infected persons are found within 14 days, and the last close contact exposure time exceeds 14 days, and the nucleic acid test is negative, then the blockade of this area can be basically lifted. However, when new cases appear in 14 days, the unsealing time will start again. After lifting the closure, it will enter a seven-day transition period, which will adopt the mode of home health monitoring.