Another retrovirus discovered at University of Alberta - Same controversy as XMRV

In the last year, there has been no shortage of controversy regarding the association of CFS with XMRV and related retroviruses.  For several years, Dr. Andrew Mason at the University of Alberta has been studying the association between Primary Biliary Sclerosis, and a Betaretrovirus bearing a close resemblance to Murine Mammary Tumor virus.  Much like the CFS studies, the research has been plagued by negative studies.  Like the study at Whittemore Peterson Institute, the virus was visualized using electron microscopy.  Like in CFS, negative studies have hampered the progress of research.