Henrich, Timothy J, Li, Jonathan Z, Felsenstein, Donna et al. · The Journal of infectious diseases · 2010 · DOI
Researchers tested whether a virus called XMRV was present in people with ME/CFS and other conditions affecting the immune system. They collected samples from 293 patients, including 32 with ME/CFS, and looked for XMRV DNA. They found no evidence of this virus in any of the samples tested.
This study addressed early speculation about whether XMRV might be a pathogenic agent in ME/CFS. Given the substantial patient burden of unexplained ME/CFS and the search for infectious etiologies, ruling out specific viral candidates helps focus research toward more likely causes and prevents investment in unproductive treatment pathways.
This study does not prove that XMRV is not involved in ME/CFS globally—the findings are specific to this Boston population and may not apply to other geographic regions. Absence of XMRV DNA does not exclude other potential viral agents or the possibility of XMRV in a different form. The study also cannot determine causation even if an association had been found.
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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