Chapenko, S, Krumina, A, Kozireva, S et al. · Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology · 2006 · DOI
This study looked at whether two common viruses (HHV-6 and HHV-7) that usually stay dormant in the body might be reactivating in people with ME/CFS. Researchers found that people with ME/CFS were more likely to have both viruses active at the same time, and when both were active, their immune cells showed signs of stress. This suggests these viruses might play a role in ME/CFS, though the study cannot prove they cause the disease.
Understanding whether herpesviruses contribute to ME/CFS pathogenesis could lead to better diagnostic tools and potential antiviral treatments. This study provides evidence that viral reactivation patterns differ significantly in ME/CFS, which may help explain the immune dysfunction and persistent fatigue observed in patients.
This study does not prove that HHV-6 and HHV-7 cause ME/CFS—it only shows an association. The cross-sectional design means researchers cannot determine whether viral reactivation triggers ME/CFS symptoms or results from immune dysfunction caused by ME/CFS. It is also unclear whether treating these viral reactivations would improve ME/CFS symptoms.
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
Chapenko, S, Krumina, A, Kozireva, S, Nora, Z, Sultanova, A, Viksna, L, et al. (2006). Activation of human herpesviruses 6 and 7 in patients with chronic fatigue syndrome.. Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology. https://doi.org/10.1016/S1386-6532(06)70011-7
BibTeX
@article{mecfsatlas-chapenko-2006-activation-human,
author = {Chapenko, S and Krumina, A and Kozireva, S and Nora, Z and Sultanova, A and Viksna, L and Murovska, M},
title = {Activation of human herpesviruses 6 and 7 in patients with chronic fatigue syndrome.},
journal = {Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology},
year = {2006},
doi = {10.1016/S1386-6532(06)70011-7},
note = {PubMed: 17276369},
url = {https://www.mecfsatlas.com/evidence/chapenko-2006-activation-human},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/chapenko-2006-activation-human
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