XMRV - found in Lyme Disease and Chronic Fatigue Syndrome. Also see Retrovirus Variants program.Encyclopedia Entry for Xenotropic Murine Leukemia Virus :Xenotropic Murine Leukemia Virus (XMRV). May be caused by: Autism, Fibromyalgia, Multiple Sclerosis, Amyotrophic Lateral Sclerosis, Parkinson s, Chronic Fatigue Syndrome (CFS), Prostate cancer.Information from Marcello Allegretti.