Buchwald, D, Wener, M H, Pearlman, T et al. · The Journal of rheumatology · 1997
Researchers tested blood samples from 153 patients with severe fatigue to see if certain immune markers were elevated, thinking that an overactive immune system might cause ME/CFS. They found that three markers (C-reactive protein, beta 2-microglobulin, and neopterin) were higher in fatigued patients compared to healthy controls, but these markers couldn't reliably distinguish between ME/CFS and other types of chronic fatigue. The results suggest that some patients have signs of immune activation, but it's unclear whether this is a temporary response to infection or part of the ongoing illness.
This study provides empirical evidence that some ME/CFS patients show measurable immune system activation, validating the biological basis of the illness rather than attributing it to psychiatric causes. However, the findings also highlight that single immune markers are insufficient for diagnosis, pointing toward the need for more comprehensive biomarker panels and investigation into the origins of immune activation in ME/CFS.
This study does not prove that immune activation causes ME/CFS, only that it is associated with the condition in some patients. The cross-sectional design cannot establish causality or temporal relationships. The inability to distinguish CFS from CF patients using these markers suggests that immune activation may not be specific to ME/CFS or that additional biomarkers are needed for specificity.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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