Lane, R J M, Soteriou, B A, Zhang, H et al. · Journal of neurology, neurosurgery, and psychiatry · 2003 · DOI
Researchers tested muscle samples from ME/CFS patients to see if they contained enterovirus (a type of virus). They found that about 21% of ME/CFS patients had enterovirus in their muscles, while none of the healthy control subjects did. Patients with enterovirus in their muscles were more likely to show abnormal lactate (a byproduct of muscle work) buildup during exercise, suggesting their muscles weren't using energy efficiently.
This study provides potential biological evidence for post-viral etiology in a subgroup of ME/CFS patients and suggests a mechanism linking viral persistence to exercise intolerance and abnormal energy metabolism. Identifying enterovirus as a possible trigger and understanding the metabolic consequences could guide targeted diagnostic and therapeutic approaches for affected patients.
This study does not prove that enterovirus causes ME/CFS in all patients, nor does it establish whether the virus is actively replicating or is simply a persistent remnant. The cross-sectional design cannot determine whether enterovirus infection preceded symptom onset or whether abnormal lactate response is a direct consequence of viral infection versus a separate pathophysiological process. Additionally, findings in 20% of CFS patients do not explain the etiology or mechanisms in the remaining 80%.
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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