Ablashi, D V, Eastman, H B, Owen, C B et al. · Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology · 2000 · DOI
This study looked at whether a common virus called HHV-6 might be reactivated in ME/CFS patients. Researchers found that ME/CFS and MS patients had higher levels of antibodies (immune markers) to HHV-6 compared to healthy people, and they detected active virus in blood cells from these patients. The findings suggest that HHV-6 reactivation might play a role in causing or worsening ME/CFS symptoms.
This study provides early evidence that HHV-6 reactivation may contribute to ME/CFS pathogenesis rather than simply being an incidental finding. Understanding viral reactivation mechanisms could open new diagnostic and therapeutic avenues for ME/CFS patients who currently lack biomarkers and disease-modifying treatments.
This study does not prove that HHV-6 reactivation causes ME/CFS, only that it is more frequently detected in patients. The cross-sectional design cannot establish temporal relationships or distinguish whether viral reactivation is a primary driver of disease or a consequence of immune dysfunction. It also does not clarify whether HHV-6 reactivation is sufficient to cause ME/CFS or simply a contributing factor.
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
Ablashi, D V, Eastman, H B, Owen, C B, Roman, M M, Friedman, J, Zabriskie, J B, et al. (2000). Frequent HHV-6 reactivation in multiple sclerosis (MS) and chronic fatigue syndrome (CFS) patients.. Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology. https://doi.org/10.1016/s1386-6532(99)00079-7
BibTeX
@article{mecfsatlas-ablashi-2000-frequent-hhv,
author = {Ablashi, D V and Eastman, H B and Owen, C B and Roman, M M and Friedman, J and Zabriskie, J B and Peterson, D L and Pearson, G R and Whitman, J E},
title = {Frequent HHV-6 reactivation in multiple sclerosis (MS) and chronic fatigue syndrome (CFS) patients.},
journal = {Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology},
year = {2000},
doi = {10.1016/s1386-6532(99)00079-7},
note = {PubMed: 10738137},
url = {https://www.mecfsatlas.com/evidence/ablashi-2000-frequent-hhv},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/ablashi-2000-frequent-hhv
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