Because of the risk control of the epidemic unit, why?

The residential areas where cases and asymptomatic infected people live and the surrounding areas with frequent activities can be divided into closed control areas.

From 4 days before the onset of the case or 4 days before the asymptomatic infected person collects positive samples to before the isolation control, if it is possible to spread to people in workplaces, activity places and other areas, and it is difficult to track and determine close contacts and sub-close contacts, the relevant areas can also be designated as closed control areas. The closed control area can be accurately divided into communities (natural village groups), buildings and units.

Management measures: the closed control area shall be "closed within the area, staying indoors and serving at home". All personnel tested 1 times of nucleic acid every day for the first 7 days, 18 days and 14 days.

Release Standard: Blocked areas can be released when the following conditions are met:

① asymptomatic infected persons; There were no new cases or asymptomatic infections in this area in recent 14 days;

② The last close contact in this area was exposed for more than 14 days, and the nucleic acid test was negative;

③ All personnel in the area completed a round of nucleic acid screening 2 days before unsealing, and all were negative.