“…This might also be the case for other abnormal aspects of the stress response system in ME/CFS, including the dysfunctional hypothalamus-pituitary-adrenal axis [18,19]. With regard to the grading of physical activity levels in the rehabilitation protocol of Vos-Vromans et al [5], it would have been interesting to examine the possible impact upon established markers of immune hyper-responsiveness to exercise. Following exercise, ME/CFS patients have more pronounced complement system (i.e.…”