How long will close contacts in Rizhao, Shandong be isolated?

Isolate at the centralized isolation point. Nucleic acid was detected on days 1, 4, 7, 10 and 14 of centralized isolation. (centralized isolation 14 days, during which nucleic acid was detected 3 times and antibody was detected 1 time) and "7+ 1" (home observation or centralized isolation for 7 days, due nucleic acid detection 1 time) medical observation measures.

Close contacts who secretly receive confirmed cases: 1. Clear time point, starting from 2 days before the symptoms of suspected cases and confirmed cases, or starting from 2 days before the sampling of asymptomatic infected people.

2. Have had close contact with suspected cases, confirmed cases or asymptomatic infected persons.

3. No effective protective measures have been taken. Close contacts should complete the epidemiological investigation of the case within 24 hours.