Forgive me, but I have to strongly disagree. We prepare for nuclear war. That is a "black swan" event. Yet there is far less money spent on preparing for something that is way more likely, a pandamic. Virus outbreaks are very risky. Look at Ebola, MERS and SARS in our very recent history. Look at Spanish flu that killed 50M to 100M. This is no mystery at all.
We know all about virus spread. There are models to predict what would happen, given certain viral coefficients. If it is airborne it is likely to spread faster than if just contagious, everything else being equal. Just look at Bill Gate's TED talk 4 years ago. He talks about the very same thing: nukes are not the threat, a pandemic is. So you can argue that there should not be any preparation for a pandemic because you cannot predict them, but I say otherwise. It is just a question of when, not if. History repeats itself.
If that argument holds water, then why do they do it with nukes?