Kenyon, Julia C, Lever, Andrew M L · British medical bulletin · 2011 · DOI
A virus called XMRV was discovered in 2009 and researchers initially thought it might be linked to ME/CFS. However, studies from different countries could not confirm this connection, and many scientists now believe the virus was not actually present in patient samples but was instead introduced by accident during laboratory testing. While the virus can infect human cells in theory, it does not appear to be a significant cause of ME/CFS.
This review is important because it documents a significant episode in ME/CFS research where an initially promising viral lead was systematically investigated and ultimately disproven. Understanding how contamination and false leads occur in research helps the ME/CFS community critically evaluate future viral hypotheses and strengthens scientific rigor in disease investigation.
This study does not prove that XMRV plays no role whatsoever in any human disease, only that the evidence for association with ME/CFS and prostate cancer is not supported by reproducible research. The review cannot establish causation or define XMRV's true epidemiology, as the underlying data quality was compromised by contamination. It also does not fully explain why some serological reactivity to the virus was detected despite negative nucleic acid findings.
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
Kenyon, Julia C & Lever, Andrew M L (2011). XMRV, prostate cancer and chronic fatigue syndrome.. British medical bulletin. https://doi.org/10.1093/bmb/ldr010
BibTeX
@article{mecfsatlas-kenyon-2011-xmrv-prostate,
author = {Kenyon, Julia C and Lever, Andrew M L},
title = {XMRV, prostate cancer and chronic fatigue syndrome.},
journal = {British medical bulletin},
year = {2011},
doi = {10.1093/bmb/ldr010},
note = {PubMed: 21551158},
url = {https://www.mecfsatlas.com/evidence/kenyon-2011-xmrv-prostate},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/kenyon-2011-xmrv-prostate
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