S. Korea has a very aggressive investigation of movements of infected persons. Once a person is found to be infected, they go through CCTV recordings, cellphone

S. Korea has a very aggressive investigation of movements of infected persons. Once a person is found to be infected, they go through CCTV recordings, cellphone location records, etc and warn people who were in the same location at same time. They also release to the press the location/time infected person was at, such as name of hospital/events. And these are reported to the public. So S. Korea does not do a carpet bombing type of lock down as China but more of a surgical strike type of lock down. But it is a lock down.