How do you know if you have CFS? It was my understanding that there isn’t a *test* for this, has that changed?
The first study linking CFS and XMRV by the U. of Nevada's Wittemore Peterson Institute (WPI), National Cancer Institute and Cleveland Clinic was published in October 2009.
Since then the virus has proved very hard to find even in advanced laboratories at the limit of PCR technology, supposedly the gold standard for virus detection. During the past year WPI resorted to culturing XMRV virus from CFS patient samples which takes up to two months.
Then in August a lab bought by WPI called VIP Dx made available a serology test which detects antibodies that a person makes to the XMRV virus and that test still takes six weeks to get back from VIP Dx.
Here is the link to VIP Dx if you want your blood tested for XMRV and related retroviruses: