That's really great. Unfortunately it only takes 1 to arrive on a plane to spread it over an entire continent.
Possibly, however lets take the number of passengers that travelled from China to Australia (only) say from Christmas Day until mid-December; call it 5 weeks.
And we'll only look at Qantas flights, some which had no precautions at all in the early part of the outbreak; 10 per week @ 300 pax on each. That's 15,000 pax and crew (they'd been out and about on their overnights too).
To the best of my knowledge, none of those passengers or crew have been found to have contracted the virus
on the aircraft. Added to that, no-one who was aboard the inbound flight or Tiger flight with the 4 or 5 affected passengers now in Queensland, appear to have been infected either.
Multiply that across every other non-Chinese airline operating from China and Hong Kong to various destinations around the world and it's hard to justify the hysteria displayed from some quarters, even here on Pprune amongst 'professionals', who would have you believe that just to be close to a passenger cabin is a death sentence (my hysterics!
).
Yes, definitely maintain the precautions - they're apparently working - but contain the hysteria. It only makes a poor situation worse.