It is the most dangerous continent, as in there are more deadly 'dangers'(?) per square metre in Australia than any other continent. Aside from that classification which no one pays attention to, or knows of, Australia is harmless.
As for Box Jellyfish, I wouldn't worry so much about them. It's the Blue Ringed Octopus you should be worried about. But you'll find that hardly anyone pays much attention to these problems, as most of it is localised to Northern Queensland.
Other than that, if you leave Spiders, snakes, etc, etc alone, they'll leave you alone. Australia is a safe place
Alcar...