[lorinda]

Im sure that when the next wave of suicide attacks (self-infection, followed by a day of sneezing at Grand Central Station) are finally worked out as a clever way to do such things, that this will eventually happen with some contagious disease.
The big question would be which disease, and how quickly it could be contained, compared to cost.
It's almost an ethical question, even though it's obvious that no ammount of money is worth one life, unfortunately even governenments only have x ammount of money, and you cannot vaccinate against everything that life can throw at you.
I believe that the chances of a major terrorist caused outbreak causing 1000 or more deaths, in the most hated nation in the world in the next 30 years is about 98%, but knowing which outbreak to defend against is very difficult.

As to question two, governments use the 100% rule (ie: it has already happened) before doing anything

I hope i haven't just caused a terrorist attack with the self-infection idea, Ive never heard it discussed, and it would definately get through customs :O