Palomo, Irene Mena, Cox, Brandon, Williams, Marshall V et al. · Journal of medical virology · 2026 · DOI
This study found that people with ME/CFS have higher levels of immune responses to three common viruses (EBV, HHV-6, and VZV) compared to healthy people. About 72% of ME/CFS patients showed antibodies to multiple viruses at the same time, versus only 31% of healthy controls. The antibody levels were higher in patients with moderate to severe fatigue, suggesting a possible connection between these viral reactivations and symptom severity.
This study provides potential objective biomarkers (herpesvirus antibody patterns) that could help diagnose ME/CFS and stratify patient severity, addressing a major clinical challenge since no validated diagnostic test currently exists. The strong association between specific antibody patterns and fatigue severity suggests these viral markers may be useful for understanding disease mechanisms and potentially guiding treatment approaches.
This study does not prove that herpesvirus reactivation causes ME/CFS or fatigue—it only shows an association. The presence of elevated antibodies indicates past or ongoing immune response to these viruses, but does not establish whether viral reactivation is a primary driver, a consequence, or an incidental finding in ME/CFS. The study cannot determine causality and should be viewed as correlational evidence requiring mechanistic follow-up studies.
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
Palomo, Irene Mena, Cox, Brandon, Williams, Marshall V, & Ariza, Maria Eugenia (2026). Chronic Reactivation of Persistent Human Herpesviruses EBV, HHV-6 and VZV and Heightened Anti-dUTPase IgG Antibodies Are a Recurrent Hallmark in Post-Infectious ME/CFS and is Associated With Fatigue.. Journal of medical virology. https://doi.org/10.1002/jmv.70769
BibTeX
@article{mecfsatlas-palomo-2026-chronic-reactivation,
author = {Palomo, Irene Mena and Cox, Brandon and Williams, Marshall V and Ariza, Maria Eugenia},
title = {Chronic Reactivation of Persistent Human Herpesviruses EBV, HHV-6 and VZV and Heightened Anti-dUTPase IgG Antibodies Are a Recurrent Hallmark in Post-Infectious ME/CFS and is Associated With Fatigue.},
journal = {Journal of medical virology},
year = {2026},
doi = {10.1002/jmv.70769},
note = {PubMed: 41451845},
url = {https://www.mecfsatlas.com/evidence/palomo-2026-chronic-reactivation},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/palomo-2026-chronic-reactivation
Contribute
Private, reviewed by a human. Not a public comment thread.