Mehalick, Melissa L, Schmaling, Karen B, Sabath, Daniel E et al. · Fatigue : biomedicine, health & behavior · 2018 · DOI
This study looked at how different types of immune cells (called lymphocytes) change over 18 months in people with ME/CFS and whether these changes connected to symptom severity and physical ability. Researchers tracked three types of immune cells in 93 ME/CFS patients and measured their fatigue, physical functioning, and energy levels over time. They found that certain immune cell patterns were linked to worse physical function and more symptoms, suggesting the immune system may play a role in ME/CFS severity.
Understanding which immune cell abnormalities correlate with specific ME/CFS symptoms could help explain disease mechanisms and potentially guide future diagnostic or therapeutic approaches targeting these cell populations. This work contributes to growing evidence that immune dysfunction is not merely incidental to ME/CFS but may actively influence symptom burden and functional impairment over time.
This study does not establish that lymphocyte changes cause ME/CFS symptoms—only that they are associated over time. The modest correlations do not prove lymphocytes are the primary driver of fatigue or dysfunction, and correlation does not confirm causation. The small sample size and naturalistic design cannot rule out confounding factors or alternative explanations for the observed associations.
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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