Kunstman, Kevin J, Bhattacharya, Tanmoy, Flaherty, John et al. · AIDS (London, England) · 2010 · DOI
Researchers tested nearly 1,000 men for a virus called XMRV that had been found in some ME/CFS patients. They found no evidence of this virus in any of the men tested, even though the virus had been detected in a small percentage of healthy people from similar geographic areas. This suggests that if XMRV is linked to ME/CFS, it may only occur in certain populations.
Early reports suggested XMRV might be associated with ME/CFS, generating significant patient hope and concern. This negative study in a large well-characterized cohort contributes important epidemiological data about XMRV's actual prevalence in the general population and helps contextualize earlier findings that may have overestimated the virus's significance.
This study does not prove that XMRV is unrelated to ME/CFS, as it tested HIV-risk men rather than ME/CFS patients directly. The absence of detection in this population does not rule out XMRV's presence in other geographic regions or in ME/CFS-specific populations. Cross-sectional design limits causal inference.
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 →
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