I think Davis is right about the use of antimicrobials. I had antibiotic treatment for supposed Lyme disease a few years back and all I got for my trouble was more sick. I now have ulcerative colitis to deal with as well as ME and that was directly caused by the antibiotics. Some people have Lyme or some other bacterial infection and the symptoms can look very similar to ME. In those cases, they will get tested, have treatment, and potentially get well again. But most people with ME don't get better on these treatments. It's not just me, these treatments have been dished out to lots of people and if they worked we wouldn't be where we are now.
This treatment failure, along with the lack of evidence for ongoing infection from studies, the fact that we aren't dying much younger than healthy people which you would expect to see if there was a chronic pathogen involved, and other signs such as half of ME patients being effectively immune to cold and flu (which to me suggests our immune system is active and able to fight of invaders in many cases) suggest that there is no chronic infection going on in most cases. I absolutely think that infection can cause ME but it isn't required to explain the results here. That doesn't mean it is ruled out either, but in the absence of evidence, I don't think it's logical to assume a piece of the puzzle exists when it may not.
Under Conclusions:
The study of larger cohorts from diverse geographical areas, and comparison with related medical disorders like depression and posttraumatic stress disorder, will be needed to validate the universality and specificity of these findings.
Why compare specifically with these disorders. Why not compare with MS or other?
There must be a reason these were chosen for comparison. I can speculate but would like to know their reasoning.
Good question. I look forward to hearing the official answer as well. One factor may be that depression and PTSD are conditions that are often misdiagnosed as ME - and perhaps even deliberately muddled together by some people - and therefore being able to distinguish between them on the basis of objective testing would be very useful. I imagine there is some overlap but that ME will look very different as a whole, with the metabolic changes far more broad in comparison. There are probably some interesting organic diseases that could be compared against as well, and perhaps as this might help provide insight into those diseases, funders of research into those diseases might help by providing funds for such comparisons?