Recent research has found xenotropic murine leukemia virus-related virus, or XMRV — a retrovirus in the same family of viruses as the AIDS virus — in nearly 98% of about 300 patients with so-called “chronic fatigue” syndrome. The study was performed and a paper co-authored by 14 scientists at the Whittemore Peterson Institute in Reno, Nevada, the National Cancer Institute, and the Lerner Research Institute (Cleveland Clinic). While the highly credentialed team cautioned that they had not yet proved that XMRV causes the syndrome, the lead researcher, Dr. Mikovits, said she thought the virus would turn out to be the cause of not just chronic fatigue but other illnesses, including being linked to particularly aggressive prostate cancers.