I just left a quick comment on this article by Dr Holtorf. He is just misinterpreting what the immunosupressed study results meant. The study he is referring to has a summary here: http://www.virology.ws/2010/05/19/xmrv-in-human-respiratory-tract/
Dr Holtorf's article is full of factual errors and erroneous conclusions so I wouldn't be reading too much into what he said.
Thanks. What about the reference to multiple sclerosis and "other immune dysfunction diseases". Do you have any idea from what hat he is pulling that?