A quarantine of travellers would do nothing. The vector for this epidemic is the mosquito. One thing that would help would be bring back the use of DDT immediately.
Well duh! West Nile is here already. I'm talking about future diseases. My point being that we CAN'T keep them out, unless we are willing to shutdown international trade.
Millions, perhaps billions would starve if we did this.
We're just going to have to get better at treating and containing. Or we could just all die...