Other countries, in which you've got a lot of waterborne transmission, there you expect these organisms to evolve towards a high level of harmfulness, right?

And in particular, to think about a fundamental idea which I think makes sense out of a tremendous amount of variation in the harmfulness of disease organisms.

But there's another really interesting aspect of this, and this is that if you could control the evolution of virulence, evolution of harmfulness, then you should be able to control antibiotic resistance.

So, I don't really have time to talk about those things, but I did want to put them up there, just to give you a sense that there really are solutions to controlling the evolution of harmfulness of some of the nasty pathogens that we're confronted with.