Natelson, Benjamin H, Weaver, Shelley A, Tseng, Chin-Lin et al. · Clinical and diagnostic laboratory immunology · 2005 · DOI
Researchers performed spinal taps on 44 ME/CFS patients and 13 healthy people to look for signs of brain inflammation. They found that 30% of ME/CFS patients had abnormal levels of white blood cells or proteins in their spinal fluid, compared to none in the healthy group. They also found that certain immune molecules were different in ME/CFS patients, particularly in those with sudden flu-like symptom onset. These results suggest that ME/CFS may involve real physical changes in the nervous system, not just psychological factors.
This study provides objective biological evidence of central nervous system abnormalities in some ME/CFS patients, challenging the notion that ME/CFS is purely psychological. The findings of specific immune dysregulation patterns in CSF open avenues for understanding disease mechanisms and potentially identifying biomarkers for diagnosis and stratification.
This study does not prove that spinal fluid abnormalities cause ME/CFS symptoms or that all ME/CFS patients have these abnormalities—only that a subset do. The cross-sectional design cannot establish whether immune changes are primary drivers of illness or secondary consequences of the disease process. Correlation between CSF findings and clinical features does not establish causation.
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
Natelson, Benjamin H, Weaver, Shelley A, Tseng, Chin-Lin, & Ottenweller, John E (2005). Spinal fluid abnormalities in patients with chronic fatigue syndrome.. Clinical and diagnostic laboratory immunology. https://doi.org/10.1128/CDLI.12.1.52-55.2005
BibTeX
@article{mecfsatlas-natelson-2005-spinal-fluid,
author = {Natelson, Benjamin H and Weaver, Shelley A and Tseng, Chin-Lin and Ottenweller, John E},
title = {Spinal fluid abnormalities in patients with chronic fatigue syndrome.},
journal = {Clinical and diagnostic laboratory immunology},
year = {2005},
doi = {10.1128/CDLI.12.1.52-55.2005},
note = {PubMed: 15642984},
url = {https://www.mecfsatlas.com/evidence/natelson-2005-spinal-fluid},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/natelson-2005-spinal-fluid
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