That thing might explain - even if everything that the dutch researchers says is correct - why they couldn't find XMRV in samples that were XMRV positive: They used PCR on a sample sent to them by Dr. Mikovits - a sample, that as I understand it (and correct me if I'm wrong), might still have replicating cells - and found XMRV (let's assume, although I'm really suspicious about these dutch researchers, as well as the british ones). Than, they took their own samples - old samples in which the cells were not replicating - and used, let's say, the same PCR test on them. They didn't find anything because the cells in these cases were not replicating, as oppose to the case with the WPI sample. On the other hand, WPI have tested the samples sent to them by the dutch with verious testing methods that does not require replicating cells, and found XMRV in some of the samples. Now, that being said, I don't think it could take anything away from the wise notes that were being raised here regarding what seems to be, at least, low quality of research in this dutch study.