Curriu, Marta, Carrillo, Jorge, Massanella, Marta et al. · Journal of translational medicine · 2013 · DOI
This study examined the immune cells in the blood of 22 people with ME/CFS and 30 healthy controls using a technique called flow cytometry. Researchers found that people with ME/CFS had some notable differences in their T cells and NK cells—types of white blood cells that help fight infections—while B cells appeared largely normal. These immune cell differences may help doctors identify ME/CFS and might explain why people with the condition get frequent viral infections.
This study identifies specific immune cell abnormalities that could potentially serve as biological markers to help diagnose ME/CFS objectively, moving beyond subjective symptom reporting. Understanding that T cell immunity is downregulated in ME/CFS provides a mechanistic explanation for the frequent viral reactivations and infections reported by patients, which could guide future treatment strategies.
This cross-sectional study cannot establish causation—it shows that these immune differences exist in ME/CFS but does not prove whether they cause the illness, result from it, or represent an adaptive response to underlying pathology. The relatively small sample size (22 CFS patients) limits the generalizability of findings, and the study does not track whether these immune signatures change over time or predict clinical outcomes.
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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