Shame on You
I don't think that the WPI is saying "XMRV variants" in the sense of variants of "XMRV vp62" (the Silverman/Abbott clone). I have asked directly a scientist I know who is working with Dr. Mikovits and she said that WPI's work covers all human gammaretroviruses including "XMRV and its variants" and that those variants include all known human MLV-related viruses. That is what was licensed by WPI to VIPdx according to her as well.
My friend reported that Alter/Lo found human MLV-related viruses, not "just XMRV vp62". That means that there has to be a potential for more than two different types of retroviruses. The most important point you make is that Switzer didn't find any human MLV-related viruses. Therefore, the CDC's test couldn't find even one type of XMRV let alone any other human MLV-related viruses. This means that the WPI will be completely vindicated and that the problem will be bigger and more complex than anyone has thought about.
•XMRV and related MLVs are in the donor supply with an early prevalence estimate of 3%‐7%.