Some literature might suggest retroviruses, as a matter of fact - it`s harder to find agents that has not been suggested as causative, when it comes to ME. The important point however, is that no research, has found viruses/bacteria to be causative agents for our symptoms.
I see Mikovits proposing all kinds of things as fact, but without the data to back it up. Retroviruses cause alzheimers.. ME is a slow form of cancer.. etc etc. Very unscientific.
What we do have, as pointed out, is loads of immunological abnormalities. And other findings that suggests endothelial dysfunction. When this is seen together with the response rates in the rtx-trials, some kind of autoimmune/autoinflamatory disease seems likely for a subset. It then seems peculiar to not focus on these leads given first, before hunting for virus X - just for the sake of it.