[polarix]

Perhaps we could quarantine air & sea travel.

[lettergram]

Even with air and sea travel the chance of someone being infected outside those areas is minimal (unless they give you a nice bloody hug or you are feeling frisky). Much less an outbreak or something of that nature.

Most of the infected cannot even afford to travel.

[swombat]

Most.

You only need a handful propagating a suddenly airborne version of the disease to London, New York, Paris, Tokyo, Beijing...

Most is not good enough.