Mark, the argument was nothing to do with this. I was not making any point about whether people who might not have a very clearcut case of ME/CFS should be taking part in this research. Nor was I saying people with an ME/CFS-type illness are less worthy if they are XMRV-negative. I could write more but perhaps it is better to leave it but I thought I could reply to that, which seems to misrepresent what I was saying and where I am coming from, without really bringing up the issue properly. You go on to say that you're not saying that's what the argument was about. But my (user)name is mixed in twice there so thought I'd reply.