The result you gave me (1:640) is a common result (positive) for an autoimmune test (ANA).
High HHV-6 titers are often found in CFS patients. I hope you will check out MedHelp's fibro/CFS forum and read the Health Pages. Here is a link:
http://www.medhelp.org/health_pages/list?cid=39
Most patients with CFS usually have 2 or 3 of the following abnormalities:
Elevated IgM/IgG coxsackievirus B titer
Elevated IgM/IgG HHV-6 titer
Elevated IgM/IgG C pneumoniae titer
Decreased NK cells, either the percentage or their activity
http://emedicine.medscape.com/article/235980-diagnosis