Yeah so they published a short Q&A back in winter of 09 that provided scant information and said
based on a study by Dr. Bell in 1991. Ironically, Dr. Bell is very clear in his stance that XMRV can potentially cause ME/CFS and is insistent on seeing this through and actively participating in finding out the truth. It has been a year since and NCF hasn't contributed any money toward XMRV research or even shown modest interest in the pathogen.
the NCF's medical committee does not believe that XMRV fits this particular epidemiologic profile.