This is by no means complete, as there are an estimated at least 3,500 pieces of documented literature speaking to the physiological basis for CFS/ME. But, it's a start, and cleary it states the obvious.
Documented involvement of Viruses in ME/CFS
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"It is (ME/CFS) like some great constricting snake that denies its victims the final convulsion." Llewellyn King "A CFS patient feels the same or worse than congestive heart failure. The same or worse than late stage AIDS." Nancy Klimas: View video here.
"A CFS patient feels every day significantly the same as an AIDS patient feels two months before death." Dr. Mark Loveless, AIDS and CFS researcher, in a statement to congress on CFS Awareness day, May 12th, 1995.