You know, I've been thinking about Tordel's comment about reading too much SF. This is the bit that completely baffles me, fiction writers have gamed out pretty much every scenario going for an apocalyptic epidemic. The common transmission factor is always international travel. I'd bet that most governments around the world have war-gamed bio-warfare at one time or another, probably including such moves.
That being the case then, WHY THE HELL DID THEY KEEP LETTING PEOPLE TRAVEL? Seriously. The human race does not deserve to keep going!