Mi, Zhiqiang, Lu, Ying, Zhang, Shana et al. · Transfusion · 2012 · DOI
Researchers tested 391 healthy blood donors in China to see if they carried a virus called XMRV, which had been found in some people with chronic fatigue syndrome. Using sensitive laboratory tests, they found no evidence of this virus in any of the blood donors. This suggests that XMRV may not be present in the Chinese blood donor population.
Since XMRV was proposed as a potential cofactor in ME/CFS pathogenesis, understanding its prevalence in different populations is critical for evaluating its role in disease. Geographic variation in XMRV detection—some regions positive, others negative—has important implications for understanding whether XMRV is a genuine pathogenic agent or a contaminant.
This study does not prove XMRV is not associated with ME/CFS globally, as it only examined healthy blood donors in one region and does not directly study ME/CFS patients. The absence of virus in this population does not address whether XMRV plays a role in disease pathogenesis where it may be present, nor does it explain the conflicting findings from other laboratories.
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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