Confirming earlier scientific doubts, a new study concludes that chronic fatigue syndrome is not caused by two viruses known as XMRV and pMLV.
Researchers from the U.S. National Institutes of Health, the U.S. Centers for Disease Control and Prevention, Columbia University and other institutions, including some scientists who did the original research, examined 147 patients with chronic fatigue syndrome from sites across the country and compared them to 146 healthy patients.
Bottom line? “This analysis reveals no evidence of either XMRV or pMLV infection,” the authors wrote. The study is published in the September/October issue of the journal mBio.

