Chia, J K S, Chia, A Y · Journal of clinical pathology · 2008 · DOI
This study examined stomach biopsies from 165 ME/CFS patients to look for enterovirus (a type of virus) because many patients report stomach problems. Researchers found that 82% of ME/CFS patients had signs of enterovirus in their stomach cells, compared to only 20% of healthy control patients. Some patients tested positive for the virus years apart, suggesting a persistent infection rather than a one-time illness.
This research addresses a longstanding question about whether viral infections could cause or perpetuate ME/CFS, particularly in patients with gastrointestinal symptoms. The high prevalence of enterovirus detection in stomach tissue provides a potential diagnostic target and could justify investigation into antiviral or other targeted treatments for a subset of ME/CFS patients.
This study does not prove that enterovirus causes ME/CFS, only that it is more frequently detected in CFS patients' stomach tissue than in controls. The cross-sectional design means we cannot determine whether the virus preceded symptom onset or is a consequence of immunological dysfunction. The clinical significance of non-cytopathic (non-cell-damaging) enterovirus infection remains unclear.
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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