Tate, Warren, Walker, Max, Sweetman, Eiren et al. · Frontiers in neurology · 2022 · DOI
This study explores why ME/CFS and Long COVID symptoms persist and come and go in cycles. The researchers propose that after an initial trigger—like a viral infection, chemical exposure, or major stress—inflammation spreads to the brain through damaged blood vessels, causing ongoing brain inflammation that keeps the illness cycling. They suggest that similar mechanisms may explain why both ME/CFS (from various causes) and Long COVID (from COVID-19) produce remarkably similar symptoms despite different starting triggers.
This study matters because it offers a coherent theoretical framework explaining why ME/CFS symptoms are persistent and cyclical despite diverse initial causes, and why Long COVID so closely mirrors ME/CFS despite arising from a single pathogen. Understanding these shared neuroinflammatory mechanisms could guide future research toward targeted biomarkers and treatments that address the brain's role in sustaining disease. For patients, this hypothesis emphasizes that neurological dysfunction is central to the illness rather than peripheral or psychiatric.
This study does not prove that blood-brain barrier dysfunction or neuroinflammation actually occurs in ME/CFS patients—it proposes a hypothesis based on existing literature rather than presenting new experimental data. It does not establish causation or identify which mechanisms are primary versus secondary, nor does it explain why some patients recover while others develop chronic illness. The study also does not distinguish between distinct biological subtypes of ME/CFS or validate that Long COVID and ME/CFS share identical pathogenic mechanisms.
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
Tate, Warren, Walker, Max, Sweetman, Eiren, Helliwell, Amber, Peppercorn, Katie, Edgar, Christina, et al. (2022). Molecular Mechanisms of Neuroinflammation in ME/CFS and Long COVID to Sustain Disease and Promote Relapses.. Frontiers in neurology. https://doi.org/10.3389/fneur.2022.877772
BibTeX
@article{mecfsatlas-tate-2022-molecular-mechanisms,
author = {Tate, Warren and Walker, Max and Sweetman, Eiren and Helliwell, Amber and Peppercorn, Katie and Edgar, Christina and Blair, Anna and Chatterjee, Aniruddha},
title = {Molecular Mechanisms of Neuroinflammation in ME/CFS and Long COVID to Sustain Disease and Promote Relapses.},
journal = {Frontiers in neurology},
year = {2022},
doi = {10.3389/fneur.2022.877772},
note = {PubMed: 35693009},
url = {https://www.mecfsatlas.com/evidence/tate-2022-molecular-mechanisms},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/tate-2022-molecular-mechanisms
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