On tests such as XMRV, I agree it would be great to know and important to know, especially as this is an infectious virus. However scientists who research people's blood don't always come up with spectacular results like this. Consider participating in the bio bank as a DONATION of your time and blood in order to help science figuring out ME/CFS. That's what's important. The individual results are not always important. ETA: As some of you may know I am a RN, I worked in chemo unit unto I got ill. We did lots of clinical trials there, for new drugs for cancer. While clinical trial is the last resort for the patients, their last hope for a cure or buying them time, the oncologists make it very clear with them that the goal of the trial (especially Phase 1 and 2) is to find out more information about the study drug, how the drug works in the body, what dosage is appropriate, what dosage is toxic. What are the side effects. More doctor visits are expected, more blood work, and more time at the clinic. While they may benefit from the drug, patients know that their contribution will be for the generation to come and not for their own benefits. They don't get renumeration whatsoever for this. Just the satisfaction that they have contributed to make a better world.