Ma, Xiaochu, Zhou, Shiying, Wei, Meili et al. · Virus genes · 2012 · DOI
This study investigated whether XMRV, a virus previously thought to be associated with chronic fatigue syndrome, could actually infect human cells. Researchers found that XMRV is a laboratory-made virus created accidentally during experiments with mouse tissues, not a naturally occurring pathogen. Testing showed that XMRV cannot infect human immune cells, suggesting it is unlikely to cause disease in people.
This study provided critical evidence that XMRV is a laboratory artifact rather than a naturally occurring human pathogen, which was important for resolving controversial earlier claims linking XMRV to ME/CFS. The findings helped redirect ME/CFS research toward other potential viral and biological mechanisms. Understanding that XMRV cannot infect human cells was essential for clarifying the scientific record and maintaining research credibility.
This study does not prove that no retrovirus is associated with ME/CFS—it only demonstrates that XMRV specifically cannot infect human cells and is laboratory-derived. The inability of XMRV to infect human cells does not exclude the possibility that other viruses or pathogens may be involved in ME/CFS pathogenesis. This work addresses XMRV specifically and does not assess other potential etiological agents.
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
Ma, Xiaochu, Zhou, Shiying, Wei, Meili, Chen, Yanxia, Li, Jiaqiang, Xiong, Weiliang, et al. (2012). Phylogenetic and biological analysis of a laboratory-generated gammaretrovirus xenotropic murine leukemia virus-related virus (XMRV).. Virus genes. https://doi.org/10.1007/s11262-012-0778-x
BibTeX
@article{mecfsatlas-ma-2012-phylogenetic-biological,
author = {Ma, Xiaochu and Zhou, Shiying and Wei, Meili and Chen, Yanxia and Li, Jiaqiang and Xiong, Weiliang and Jiang, Shibo and Pan, Chungen},
title = {Phylogenetic and biological analysis of a laboratory-generated gammaretrovirus xenotropic murine leukemia virus-related virus (XMRV).},
journal = {Virus genes},
year = {2012},
doi = {10.1007/s11262-012-0778-x},
note = {PubMed: 22735937},
url = {https://www.mecfsatlas.com/evidence/ma-2012-phylogenetic-biological},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/ma-2012-phylogenetic-biological
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