[tylerl]

Probably just misunderstood; what you said is a mixed up jumble of bits of actual facts.

C.diff is something that you always have some of (you'll never be rid of it, nobody is), but it usually gets out-competed by other bacteria. But it's exceptionally hard to kill partly because it can form tough spores that go dormant. So if you take powerful antibiotics, there's a good chance that all that'll be left is the c.diff, which gets problematic when there's a lot of it. Fungus is similar in the sense that bacteria compete with it, so killing the bacteria leaves you vulnerable to fungus as well.

This is precisely why you're supposed eat probiotics during certain kinds of treatments. People talk about "healthy gut flora" or whatever like its a new age alternative medicine, but really you just need a ton of different kinds of benign bacteria filling the space so that no particular one strain of pathogen gets enough critical mass to have an effect.