I'm not sure how meaningful this argument ultimately is. I can think of at least two major pathogens - enteroviruses and Borrelia - that can explain, at least in part, most ME/CFS symptom clusters. But conventional testing is frequently inadequate for such illnesses. It is woefully easy to take a Lyme patient who one day tests only 4 IgG bands positive and have an ID or rheumotologist claim she cannot have Lyme; she must have ME/CFS - and then have her Bb values shoot up to 6 bands the next month. Multiply that by tens of thousands of patients, and there's potentially a problem that is rooted in testing short-falls.I don't think anyone is arguing that chronic infection cannot exist but rather that the evidence for it playing a major role in ME/CFS just isn't there.
So, to declare we cannot see a pathogen when testing pwME might simply be stating an obvious problem even when a pathogen is responsible.
This is not to say ME/CFS is not an autoimmune disorder, or some sort of gross immune disruption. It is just pointing out we are no where near the point where we can confidently rule out all pathogens.
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