I should point out that it is very easy, just using simple logic, to prove that herpes family viruses such as HHV-6 and EBV cannot be the triggering viruses of ME/CFS. This logic is as follows:
You can exclude herpes family viruses from being the precipitating infectious cause of ME/CFS simply by the fact that (a) ME/CFS most frequently develops in adults, (b) nearly all adults will already have HHV-6 and EBV in their body, since HHV-6 is usually picked up before you are 3 years old, and EBV is picked up usually in the teenage years. Ergo, when you observe that you have caught some virus that then precipitated your ME/CFS, it is very unlikely to ever be HHV-6 and EBV, since the majority of adults already have these two viruses in their body already.
I am not sure why ME/CFS researchers have overlooked this basic fact, which generally rules out HHV-6 and EBV as being the triggering viruses of ME/CFS. Of course, HHV-6 and EBV already in your body may be reactivated by the immunosuppression of ME/CFS, and may then contribute to ME/CFS symptoms, sure, that is another story. So it is still a good idea to take anti-herpes drugs. But HHV-6 and EBV cannot be the triggering virus of ME/CFS that you catch as a adult, in the general case at least).
Enteroviruses such as coxsackievirus B and echovirus are a different story, because although one or two of these may be caught early in life, there are in fact 6 serotypes of coxsackievirus B (not to mention the various sub-strains of each serotype), and there are 32 echovirus serotypes, so you can certainly catch a nasty enterovirus later in life as an adult, even if you caught one as a child.