Chronic Fatigue Syndrome Not Caused by XMRV Virus Chronic fatigue syndrome (CFS) is a debilitating condition of physical and mental fatigue that does not lessen with rest. CFS does not have a known cause or cure, but many sufferers believe that their illness began after a viral infection. A 2009 study found a link between the XMRV virus, which is found in the DNA of mice, and CFS, ...
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