Chapenko, Svetlana, Krumina, Angelika, Logina, Inara et al. · Advances in virology · 2012 · DOI
This study tested 108 ME/CFS patients and 90 healthy people for three viruses: HHV-6, HHV-7, and parvovirus B19. The researchers found that about 65% of ME/CFS patients had active viral infections compared to only 13% of healthy people. Patients with active viral infections showed higher levels of inflammatory markers and experienced more severe symptoms, especially when infected with multiple viruses at once.
This study provides evidence that active viral infections are substantially more common in ME/CFS patients than the general population and may contribute to distinct clinical symptom patterns. Identifying viral subsets within ME/CFS could help stratify patients for targeted research and potentially inform treatment approaches.
This study demonstrates association but cannot prove that these viruses cause ME/CFS or specific symptoms—the direction of causality remains unclear. The cross-sectional design cannot determine whether viral reactivation triggers ME/CFS or whether ME/CFS predisposes to viral reactivation. Additionally, the study does not establish whether treating these viral infections would improve ME/CFS outcomes.
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, Svetlana, Krumina, Angelika, Logina, Inara, Rasa, Santa, Chistjakovs, Maksims, Sultanova, Alina, et al. (2012). Association of active human herpesvirus-6, -7 and parvovirus b19 infection with clinical outcomes in patients with myalgic encephalomyelitis/chronic fatigue syndrome.. Advances in virology. https://doi.org/10.1155/2012/205085
BibTeX
@article{mecfsatlas-chapenko-2012-association-active,
author = {Chapenko, Svetlana and Krumina, Angelika and Logina, Inara and Rasa, Santa and Chistjakovs, Maksims and Sultanova, Alina and Viksna, Ludmila and Murovska, Modra},
title = {Association of active human herpesvirus-6, -7 and parvovirus b19 infection with clinical outcomes in patients with myalgic encephalomyelitis/chronic fatigue syndrome.},
journal = {Advances in virology},
year = {2012},
doi = {10.1155/2012/205085},
note = {PubMed: 22927850},
url = {https://www.mecfsatlas.com/evidence/chapenko-2012-association-active},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/chapenko-2012-association-active
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