This article in The age reinforces the point that the only way stop it is to lockdown and severely limit movement so contact tracers can catch up. Get too many cases and they just cannot cope, which is what happened in Victoria when the NSW system was held up as gold standard.
‘Open request’: NSW pleads for contact tracing help as Sydney locks down hard
The Commonwealth, South Australian and Western Australian governments all agreed to help but Victoria knocked back the request.
www.theage.com.au