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U.K. Study Overturns Previous Research Citing Virus as Cause of CFS Reviewed by Rob Hicks, MD Chronic fatigue syndrome is not caused by the virus XMRV, according to new research. A team from University College London, the Wellcome Trust Sanger Institute, and University of Oxford, all in England, says previous research linking the virus to chronic fatigue syndrome (CFS) was flawed because of contamination of mouse cell DNA samples in the laboratory. CFS is a disorder characterized by chronic fatigue lasting six months or longer, with several additional symptoms that may include impaired memory, unrefreshing sleep, muscle pain, sore throat,...