@Carl what virus are you referring to?
Do you believe all or most cases of cfs are due to the same type of virus?
No because it is not caused by a virus. More poor research by people who cannot understand or comprehend what is happening. Viruses take advantage of immune dysfunction which, along with the mitochondria->energy dysfunction, is promoted by cytokines. When the real infection is destroyed the digestive system, multiple parts including the primary location and secondary location, heals very quickly. What is more is the pituitary and hypothalamus also heal restoring more normal function. Until they are destroyed they prevent the digestive system from healing and the Increased Digestive Permeability continues to promote immune system activation, inflammation and cytokines. This does explain very well the research findings so far ie increased permeability in several locations however research has been totally inadequate, doing it in the easiest way possible without pinpointing it correctly.
Treating viruses can help by reducing the immune system load and increased nutrient requirements. I some cases that might improve things enough to be more functional but it will not fix the underlying problems. Stephen Buhner treated a viral infection which he believed was the cause of his CFS but I think that he is still using various supplements to support his body and I would dispute whether his CFS is 100% gone.
The micro-organism itself, which can vary widely - there is a big list of possibilities, is far less important than the location. Some people manage to resolve this fairly easily using various antimicrobials. One on this forum treated a staph infection and resolved his but I suspect he has not 100% solved the IDP. Staph bacteria are not as highly resistant as other bacteria. There are also many well researched efflux pump inhibitors which can be used to make antimicrobials more effective against staph bacteria. One of the infections which causes my IDP is I believe a staph spp. I have already destroyed 2/3 rds of that. The bacteria? (it could be yeast or fungi) causing my CFS is extremely resistant. Even without their protective biofilm, which I have removed, they have resisted everything that I have used so far. I think that they might be mycoplasma bacteria, I have my suspicions based upon symptoms and I have many herbs waiting to be used against them as soon as I have everything that I require. I still have a lot to do including making a replacement set of feet for my vortex mixer because the used item from eBay had a screw and foot missing. I have made 2 so far which seem to be working well and I have 2 more to complete.
When I destroyed 2/3 rds of the staph infection it healed my digestive system in two locations in aprox 15 minutes without any supplemental L-glutamine or other "necessary" nutrients which are claimed to improve digestive permeability. If any was required my blood levels were sufficient and no additional supplementation was required.