Spindler, J, Hackett, J, Qiu, X et al. · Advances in virology · 2011 · DOI
This study tested blood samples from men in an HIV research study to see if they were infected with XMRV, a virus that had been proposed as a possible cause of ME/CFS. Researchers used two different methods to look for the virus: checking for antibodies (immune system responses) and checking for the virus itself. They found no evidence that XMRV was actually present in any of the samples tested.
Early reports linked XMRV to ME/CFS and suggested it was present in 3.7% of healthy people, raising concern about a new epidemic. This negative study using multiple detection methods provides evidence that XMRV is not as prevalent as initially reported, which has important implications for ME/CFS research and whether the virus is truly associated with the disease.
This study does not prove that XMRV is not associated with ME/CFS—it only shows the virus was not detected in this specific population of HIV-related men. The absence of XMRV in this group does not rule out its possible role in ME/CFS in other populations, nor does it explain why some earlier studies reported finding the virus.
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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