U.S. scientists have retracted part of a 2009 study from the journal Science linking chronic fatigue syndrome with a mouse virus as evidence continues to mount against the virus as a cause of the mysterious disease. In addition to the partial retraction, Science published on Thursday new research that cast doubt on the theory. A U.S.-backed study found no trace of the XMRV virus, and a related mouse virus, in blood samples taken from healthy people and those with chronic fatigue syndrome.
