the UK MEA latest statement states In the pivotal Royal Free Hospital outbreak of ME back in 1955, far more than 4% of a previously healthy population of doctors and nurses contracted an unknown infection at roughly the same time (the hospital had to close due to lack of staff). This fact would question the role of XMRV as a key predisposing factor if it only occurs in 4% of the population http://www.meassociation.org.uk/content/view/1068/216/ Since ME/CFS is not a notafiable disease how can there be a definitive defenition. This has came to my mind before xmrv due to my own experience. When I was first diagnosed in the mid eightys it was assumed that I was sporadic. However subsequent to that a close friend of mine and also a close friend of my fathers also came down. I lost contact with my friend as we were both ill but my fathers friend also suffers to this day (he has also recently had cancer (bowel I think) and a kidney removed. Anyway, many years later I made friends with my sons friends mother and as it turned out she also has ME. They live in a different area but she also worked in the London area as a nurse at the time of the not far from and at the time of the Royal Free outbreak. Some one on here stated they were born in that area around that time. Basically what I am saying or asking is has anyone ever tried to map out the so called sporadic cases to see if there is any link. I have tried to think how this could be done. The only thing I came up with was could use google map. I just wondered if anyone knew of any studies or of a way such a study could be conducted. Curiousity and all that.