When it comes to the Germ Theory vs Terrain Theory, I'm not convinced it has to be one or the other.  I tend to think that if we take proper care of our bodies, then the opportunistic germs are not a problem, but that they do exist and can cause problems in a body that isn't working right.  

That being said, it wouldn't surprise me if sometimes terrain problems (toxic foods, medicine, personal care items, EMF, etc.) get blamed on a virus that either doesn't exist or just doesn't cause the problem.  I've read some stuff relating to AIDs that makes me think that HIV isn't the actual cause of AIDs and that it either has very little or nothing to do with it.  I'm not positive about it though. 

 I was working at a research hospital in the early days of AIDS and I am her as a witness to tell you that they lied thru their teeth about it.