what i am thinking is that he named the sub-types CFS1, 2, and 3 because even tho he does not say the retrovirus causes cfs, he is basically, de facto, calling the effects of the retrovirus CFS. once these subtypes are named by him, they are named for good (for now, anyway), and anyone who wants to call them by name must use the CFS1, 2, 3, names. it is like alter is saying to all subsequent scientists who work on this MLV retrovirus, "the retrovirus IS CFS, CFS IS this retrovirus." that is what i feel from this move of his. they are not saying the retrovirus causes cfs, because they can't. technically can't. as it has not be technically proven. but they are ALMOST saying that. it's like they are coming as close as possible to saying it, without actually saying it.