With the news yesterday from WPI's Facebook page that the retrovirus that Elaine Defreitas found is not the same as XMRV, does that mean 2 retroviruses are involved? http://www.facebook.com/notes/whittemore-peterson-institute/fact8/184085913025 Or, is one connected with one subset, and (active) XMRV with a more severe subset as reported in the Science study? Should follow-up studies test for both retroviruses? Plus, if they've found two in the last 18 years, could there be other pathenogenic retroviruses involved? Or, as Dr. Peterson suggested to Cort, does a weakened or dysfunctional immune system come first? Questions, questions, questions... Any answers?