During the epidemic, there were no cases in the unit. Why did you put a seal on the door?

Because as long as there is an epidemic in the community, it must be sealed.

Recently, after positive cases appeared in some communities, the communities were closed for some time. This control measure is to find potential infected people in the shortest time by reducing the mobility of people going out and nucleic acid testing, to prevent the epidemic from spreading from the community to the society and to prevent infected people from overflowing from the community to other places.

The epidemic was caused by the spread of Omicron mutant, with a high proportion of asymptomatic infections, hidden transmission and difficult early detection. It is not enough to screen only in key areas or people. It is necessary to reduce people's mobility and reduce gathering activities in order to reduce or slow down people's mobility.