A study on chronic fatigue syndrome (CFS) has linked the mysterious and controversial disease to a recently discovered retrovirus. Just last month researchers found the same virus to be associated with aggressive prostate tumours.
CFS is marked by debilitating exhaustion and often an array of other symptoms, including memory and concentration problems and painful muscles and joints. The underlying cause of the disease is unknown; it is diagnosed only when other physical and psychiatric disease. (source: nature.com)