E2 ModerateWeak / uncertainPEM ?Case-ControlPeer-reviewedMachine draft
RETRACTED: Detection of an infectious retrovirus, XMRV, in blood cells of patients with chronic fatigue syndrome.
Lombardi, Vincent C, Ruscetti, Francis W, Das Gupta, Jaydip et al. · Science (New York, N.Y.) · 2009 · DOI
Quick Summary
This study, which has since been retracted, reported finding a virus called XMRV in blood cells from most ME/CFS patients tested, but rarely in healthy people. The researchers showed that this virus could be grown in the lab and transmitted between cells. However, subsequent studies by other scientists could not reproduce these findings, leading to the retraction of this paper.
Why It Matters
This study initially generated significant hope and research attention for ME/CFS, suggesting a potential viral cause that could lead to treatments. Understanding why this study's findings could not be reproduced remains important for improving research standards and maintaining trust in ME/CFS science.
Observed Findings
- XMRV DNA detected in 68 of 101 (67%) CFS patient samples versus 8 of 218 (3.7%) healthy controls
- Virus cultured from patient-derived samples showed infectious properties in cell culture
- Both cell-associated and cell-free transmission of XMRV was demonstrated in laboratory experiments
- Viral infection was established in previously uninfected lymphocytes and indicator cell lines exposed to patient samples
Inferred Conclusions
- The authors suggested XMRV may be a contributing factor in ME/CFS pathogenesis
- They proposed a potential viral etiology for this previously poorly understood disease
- They inferred that XMRV transmission patterns could explain aspects of disease mechanisms
Remaining Questions
- Why could independent laboratories not replicate the original findings despite using similar methodology?
- What role, if any, does XMRV play in ME/CFS, if the initial detection was due to contamination or technical artifact?
- What are the actual infectious or environmental agents, if any, contributing to ME/CFS pathogenesis?
- How can research standards be strengthened to prevent similar false discoveries in future ME/CFS investigations?
What This Study Does Not Prove
This retracted study does not establish that XMRV causes ME/CFS. The inability of numerous independent laboratories worldwide to replicate these findings, combined with evidence of technical problems and potential contamination in the original work, means the initial claims are not supported by the scientific community.
Tags
Symptom:Fatigue
Biomarker:Blood Biomarker
Phenotype:Infection-Triggered
Method Flag:PEM Not DefinedWeak Case DefinitionExploratory Only
Metadata
- DOI
- 10.1126/science.1179052
- PMID
- 19815723
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026