There is no evidence here immunity is possible. You can get the virus more than once.2 cases in Albury, there is a containment problem. Only a matter of time before Sydney is it inundated.
If outbreaks take place in Sydney (which seems like we’re just waiting for), I wonder if there’s a point where the feds change the approach from containment to herd immunity? Just posing a hypothetical, only becomes a relevant discussion if the track and trace and containment is exhausted and untenable.