Dan Peterson on HHV-6
"I have a subset of patients who have evidence of beta herpesvirus reactivation, either CMV or HHV6a or b, and for that subset of patients, particularly if they have it in their spinal fluid, they need a very potent antiviral. For beta herpesviruses we are somewhat limited to a few oral drugs that are not terribly effective, to foscarnet, which is very difficult to administer, and Vistide which is somewhat easier because the infusion is every two weeks. I have treated 65 people according to this protocol, which, relative to the world of chronic fatigue syndrome, is not very many people. But some of those people have had very dramatic responses. Some have been able to go back to work, and to normal lives."
http://www.prohealth.com/me-cfs/library/showarticle.cfm?libid=18258