Seems the message is that the negative PCR studies for contamination or real infection are invalidated and should be withdrawn. Final word on XMRV, I don't think so. Also it seems that other studies which did identify XMRV but dismissed the findings as contamination should be reexamined. You can't have assays finding contamination in one instance, and then not in another - converse of the argument they used to dismiss XMRV in the BWGS.