TABLE 1.

Timeline of events related to XMRV

Yr	Event
1992	Prostate cancer xenograft made from CWR22 sample
1999	New prostate carcinoma cell line 22Rv1 used in labs
2006	XMRV identified in prostate cancer samples
2008–2011	Multiple labs test prostate cancer samples for XMRV
2009	XMRV identified in CFS patient samples
2010	MLV-related sequences identified in CFS patient samples
2010	Multiple labs test CFS samples for XMRV
2010	Food and Drug Administration panel of experts recommends indefinite deferral of blood donors with CFS
2010–2011	Red Cross in multiple countries defers donors with history of or symptoms consistent with CFS
2011	Investigation of XMRV and possible contamination
2011	Article published tracing origin of XMRV to laboratory recombination event
2012	Key XMRV and MLV papers retracted