The CDC website Q&A on XMRV has updated. They've changed their answer to the question "Should an individual with diagnosed chronic fatigue syndrome donate blood?" Last week the answer read: At the present time, there are no specific recommendations to defer donors who have chronic fatigue syndrome. Now it says At the present time, there is no FDA guidance to defer donors who have chronic fatigue syndrome in the United States. However, FDA regulations require that a donor should be in good health. Medical directors at blood collection centers should exercise judgment in determining whether individuals with a history of CFS are in good health at the time of donation. I think they updated the prostate cancer blood donation answer, too, but I don't have a copy of what it said last week, so I'm not sure.