http://www.cfids.org/xmrv/default.asp The CAA reported the following on their XMRV page: A number of question have been raised by various people about this statement. Is it correct to say that the WPI was the only lab. Firstly, the chart next to this statement shows the FDA to also have found XMRV in the sample that was not spiked. Secondly, the test was to look for spiked samples, not real live XMRV virus. Therefore the sample that was not spiked may actually have XMRV, but would not be detected by tests which use primers and probes set for an artificial clone.