Originally Posted by plunet

Data point from a recent quarantine in Qingdao and after the 7 days in a prefab government quarantine facility (yep, not a hotel) the +3 was in the person's ground floor flat. Because the flat is on the ground floor the family use their own dedicated entrance onto the street, rather than the door off the communal staircase at the back. So the local government minders deposit the person at the ground floor flat, secure the door into the street for the +3, but omit to check that there's a 2nd door round the back onto the staircase, and this is left insecure.