Arginine promotes some viruses but is antiviral against others, like enteroviruses which are implicated in CFS/ME. It also promotes release of nitric oxide which itself will kill many viruses. I had only positive experiences from supplementing with arginine, but unfortunately tolerance developed rather quickly for me.
The eteroviruses version on ms, it have been more of a theorie, its very possible and not just eteroviruses, bacteria, mycoplasmas etc.. since our immunity is so weak, we are more susceptible, but Viruses often and strongly related to cfs are the ones from the herpes virade family, hhv6,ebv,cnv.. etc...
To lower arginine intake and increase lysine is a recommendation you will find all over for people infected with herpes virade viruses.
Im not sure if anyone of you have read about late studies of MS, on the HHV6 foundation they just put a few publications 2017, showing the strong relation all this herpes specially hhv-6 have to MS.
In this new research they are directly linking the hhv-6 , also how other virures from the herpes virade family help each other to get potency, via envelope protein.
Probably one of the most importan to us is the fact of this hepes in particular hhv-6 to suppress the expresion of the surface proteins of that alert the immune system triggering two mayor receptors on NK CELLS:NKG2D NKP30 and how they are degradaded proteasomal.
Also how the viral protein U24 my desregulate myelination, all this virues have been like to both diseases for decades, Ms since it has more funding have had alot more research, everithing point more and more that it has a viral etiology including the retroviral theorie to.