Because of the epidemic unit risk control, why?

The communities where cases and asymptomatic infected persons live and the surrounding areas with frequent activities can be classified as containment areas.

From 4 days before the onset of the case or 4 days before the collection of positive specimens from asymptomatic infected persons to before isolation and control, if it has a high possibility of spreading to people in the workplace, activity areas and other areas, and the close contact It is difficult to determine the contact tracking of , sub-close contacts, and the relevant areas can also be classified as closed and controlled areas. The closed area can be accurately divided into communities (natural village groups), buildings, units, etc.

Management measures: The closed area implements "area closure, staying at home, and providing door-to-door services." All personnel will be tested for nucleic acid once a day for the first 7 days and once on the 10th and 14th days.

Lifting criteria: The lockdown area can be lifted when the following conditions are met at the same time:

① Asymptomatic infections; no new cases or asymptomatic cases in the area in the past 14 days Infected persons;

② The last close contact in the area has been more than 14 days since the last exposure, and the nucleic acid test is negative;

③ All people in the area completed a test 2 days before the unblocking Rounds of nucleic acid screening were all negative.