Nas, K, Cevik, R, Batum, S et al. · Bratislavske lekarske listy · 2011
Researchers compared immune system markers and psychological health in 25 ME/CFS patients and 20 healthy controls. They found that ME/CFS patients had lower levels of a specific type of immune cell (CD56) and higher levels of an inflammatory marker (IL-6), along with more depression and reduced quality of life. These immune changes appeared connected to sleep problems, social isolation, and physical limitations.
This study provides evidence that ME/CFS involves measurable immune dysfunction beyond psychological factors alone, specifically implicating NK cell depletion and IL-6 elevation. The correlation between immune markers and specific symptom clusters offers potential biological targets for understanding fatigue severity and may support biomarker-driven treatment approaches.
This cross-sectional study cannot establish causation—it does not prove that low CD56 cells or high IL-6 cause ME/CFS symptoms, only that they are associated. The small sample size limits generalizability, and the study does not assess whether these immune changes persist over time or respond to treatment.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Nas, K, Cevik, R, Batum, S, Sarac, A J, Acar, S, & Kalkanli, S (2011). Immunologic and psychosocial status in chronic fatigue syndrome.. Bratislavske lekarske listy. https://pubmed.ncbi.nlm.nih.gov/21585130/
BibTeX
@article{mecfsatlas-nas-2011-immunologic-psychosocial,
author = {Nas, K and Cevik, R and Batum, S and Sarac, A J and Acar, S and Kalkanli, S},
title = {Immunologic and psychosocial status in chronic fatigue syndrome.},
journal = {Bratislavske lekarske listy},
year = {2011},
note = {PubMed: 21585130},
url = {https://www.mecfsatlas.com/evidence/nas-2011-immunologic-psychosocial},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/nas-2011-immunologic-psychosocial
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