Simmons, Graham, Glynn, Simone A, Komaroff, Anthony L et al. · Science (New York, N.Y.) · 2011 · DOI
Some researchers had claimed that a virus called XMRV might be linked to ME/CFS. This study tested blood samples from 15 people previously reported to have this virus and 15 healthy people without it, sending them to 9 different labs for testing. The labs could not consistently find the virus, and when they did find it, the results were similar in both ME/CFS patients and healthy people. This suggests the virus is not reliably present in ME/CFS patients' blood.
This study was crucial for the ME/CFS field because it provided evidence that controversial claims linking XMRV to ME/CFS could not be independently verified, preventing potentially misleading diagnostic or therapeutic directions and helping redirect research efforts toward more reproducible findings. It demonstrates the importance of multi-laboratory validation in infectious disease research and established that blood donor screening for XMRV was unnecessary.
This study does not prove that viruses play no role in ME/CFS, only that XMRV/MLVs cannot be reliably detected in blood samples using the assays tested. It does not address whether these viruses might be present in other tissues or whether other viruses or pathogens might contribute to ME/CFS. The lack of detection does not explain the biological mechanisms underlying ME/CFS symptoms.
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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