Dr. Yes
Shame on You
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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.
A variant of XMRV means any 'strain' of XMRV; the nomenclature is sometimes used a bit differently but essentially any variant of XMRV is still identified as XMRV (hence the term 'variant'). There is no one 'standard' XMRV in that sense; all genotypes of XMRV are considered variants (including VP62). However, a gammaretrovirus that is not XMRV, such as a polytropic MLV, cannot be considered a variant of XMRV by any definition.
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.
Again, this report is not clear to me. The WPI Science study for instance did not isolate any VP62 strain from its cohort, but instead found a few different strains of XMRV. These are still considered the same virus. If the Alter/Lo study found other strains of XMRV, then we are still only talking about one basic human gammaretrovirus. But if they found another one that is different enough from XMRV that it can be considered a separate retrovirus, then they may indeed have discovered a new human MLV-related virus. The infamous slide from Alter's leaked presentation stated that:
Note that this finding was in the donor supply, not CFS patients (so far as we know). "Related MLVs" presumably include things like polytropic MLVs.. the key question will be whether these are truly human retroviruses, whether they have been previously identified, and (in any case) what they are doing in the blood supply. Another question is whether they could be associated with human disease, e.g. whether they too are found in CFS patients in higher percentages than healthy donors. But the first thing, as I said, would be to check to see if the Alter paper matches the leaked Alter presentation on this issue.•XMRV and related MLVs are in the donor supply with an early prevalence estimate of 3%‐7%.
I wonder if this hopefully imminent PNAS Lo/Alter paper will discuss XMRV clades?
If they isolated and sequenced virus and found new viral strains or even new human retroviruses, I think that they would... either in this paper or in an addendum to follow.