Sixty-seven percent of 101 patients diagnosed with Chronic Fatigue Syndrome (CFS) were found to be infected with a retrovirus called XMRV (Science, published online October 8, 2009). One hundred percent of those with CFS who subsequently developed lymphomas or leukemias were infected with the XMRV virus. If further studies confirm this finding, doctors will soon have a test to diagnose this horrible condition and possibly a vaccine to prevent it.More than a million Americans are seriously ill with Chronic Fatigue Syndrome, also known as Myalgic encephalomyelitis. CFS symptoms include severe weakness, exhaustion after any activity, loss of memory, and chronic recurrent infections. Patients rarely recover.The retrovirus XMRV was first found in...