Sepúlveda, Nuno, Carneiro, Jorge, Lacerda, Eliana et al. · Frontiers in immunology · 2019 · DOI
This study suggests that ME/CFS may develop when the body's immune system becomes overprotective in response to common viruses like EBV, HSV-1, or HHV-6. Normally, the immune system fights off infections and then settles down, but in ME/CFS patients, special immune cells called Tregs may keep the immune system in a constant state of alert. Using computer models, researchers showed how this could lead to ongoing inflammation and fatigue.
Understanding how immune regulation goes awry in ME/CFS could explain why the disease persists after viral infections and why patients experience chronic inflammation despite normal-looking virus levels. This mechanistic insight might eventually lead to targeted treatments that rebalance immune control rather than broadly suppressing or activating immunity.
This computational study does not prove that abnormal Tregs actually cause ME/CFS—it shows only that a theoretical model could explain some observations. The study does not establish causation from correlation and does not validate its predictions through direct measurement of Treg function in ME/CFS patients. It also does not rule out other contributing factors to disease pathogenesis.
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
Sepúlveda, Nuno, Carneiro, Jorge, Lacerda, Eliana, & Nacul, Luis (2019). Myalgic Encephalomyelitis/Chronic Fatigue Syndrome as a Hyper-Regulated Immune System Driven by an Interplay Between Regulatory T Cells and Chronic Human Herpesvirus Infections.. Frontiers in immunology. https://doi.org/10.3389/fimmu.2019.02684
BibTeX
@article{mecfsatlas-seplveda-2019-myalgic-encephalomyelitis,
author = {Sepúlveda, Nuno and Carneiro, Jorge and Lacerda, Eliana and Nacul, Luis},
title = {Myalgic Encephalomyelitis/Chronic Fatigue Syndrome as a Hyper-Regulated Immune System Driven by an Interplay Between Regulatory T Cells and Chronic Human Herpesvirus Infections.},
journal = {Frontiers in immunology},
year = {2019},
doi = {10.3389/fimmu.2019.02684},
note = {PubMed: 31824487},
url = {https://www.mecfsatlas.com/evidence/seplveda-2019-myalgic-encephalomyelitis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/seplveda-2019-myalgic-encephalomyelitis
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