I know you find the Dubbo studies interesting Cort and so do I but I think that study on serum cytokines flawed.
It makes sense to me they found no elevations because the subjects they drew the samples from recovered "fully" from CFS within two years. One of the main researchers was quoted on Prohealth shortly after the release of that study that 95% of the affected subjects recovered wtihin 1 year and 99% within 2 years. I thought he might have been misquoted or perhaps I had read it wrong but a friend wrote to Dr. Lloyd and confirmed this. If this is true, their recovery rates beat the most optimistic results in the literature (50% improving within 10 years) when all definitions are used; the more realistic full recovery rate is less than 10% from a review done by Cairns in 2005.
http://occmed.oxfordjournals.org/content/55/1/20.abstract
So I'm not sure if their subject population is really ME/CFS (indeed the articles refers to "postinfective fatigue syndrome") or if it is, it might apply only to those folks who recovered within 2 years. It should also be noted that sleep disturbances (with over 90% of CFS patients reporting this symptom in studies) and PEM were not included explicitly in the symptoms tabulated (fig 2. original Dubbo paper)/ followed; yes a diagnosis of CFS could be made by Fukuda without these symptoms but then are we really talking about what the majority of people on this forum have?
Your point on the cytokines is well-taken and again I think it comes down to cohort selection. It should be noted that Klimas 2009 study found a lot of elevations in their patients (female only in this study) at baseline and that Mikovits' talk at S of K and at other venues previously showed elevated (and some lowered) cytokines in 100< subjects.
http://www.translational-medicine.com/content/7/1/96
It might be interesting to ask subjects if they have flu-like malaise at baseline or after exercise to pick out those subjects with cytokine abnormalities rather than only asking about fatigue. It's possible those without the flu-like malaise could have elevated cytokines but this is a way to narrow the group for study. I certainly have the had the "flu" this whole time and I have elevated cytokine levels -- almost all of them.