Actually this was mentioned in Amy Dockser Marcus' first article on the Lo/Alter paper:
"Joseph Brewer, an infectious disease doctor in Kansas City, Mo., who treats AIDS patients, said he now has 15 patients with CFS in his clinic taking anti-retrovirals. "It's a mixed bag,'' said Dr. Brewer about the results. Patients who have been sick less than two years improve more rapidly, he said, adding that one of the challenges is that there is no reliable way to measure the amount of virus present in patients."