News like what I read yesterday don't help either. Headline: 100 grams of EHEC bacteria sufficient to infect all of humanity! I mean, what use is that? Except of course the obvious: sell stupid news.
People need to wise up to the fact that at any time each of them is host to more bacteria, not all of them benign, than the world ever was to humans from the first upright walking ape to today. We're equipped to deal with them.