Several studies, including the CDC, have looked for broad indications that other mLV's are present and they haven't found them.
Suzanne Vernon Phd (of the CFIDS Association of America) said that the CDC paper on XMRV was so poor she commented: ''“ the explanation for not finding XMRV in these samples is simple – this was a study designed to not detect XMRV using a hodge-podge sample set. “
All other negative studies of XMRV in CFS also have also never replicated the SCIENCE paper methods that Lombardi et al used to detect XMRV in CFS, thus also invalidating their ablity to find XMRV in CFS patients by default. The fact is no one using the same method of Lombardi et al in the SCIENCE paper trying to find XMRV in CFS has yet failed to discount what the WPI found, that is very important for people to know.