If ALL countries do their job then it will be contained, most likely. If not then it won't be, it will bounce back and forth across different countries until it becomes endemic everywhere as we can't possibly isolate Australia from the outside world.
China now is doing a great job even if to start with they dropped the ball. Unfortunately it has required drastic action with a massive economic impact for China and knock on effects for us.
Churchill once said 'there is nothing to fear but fear itself'...probably then made his handkerchief dance by blowing a green boogie into it