Hilgers, A, Frank, J · Wiener medizinische Wochenschrift (1946) · 1994
This study examined 375 patients with ME/CFS to understand what goes wrong with their immune systems and which infections might be involved. Researchers found that most patients had problems with immune cell function, signs of past viral infections (especially Epstein-Barr virus), and imbalances in immune chemicals. The study suggests ME/CFS may be connected to autoimmune problems and multiple infections.
This comprehensive investigation provides evidence that ME/CFS involves measurable immune dysfunction across multiple systems—cellular, humoral, and activation markers—supporting the biological basis of the disease. The high rates of herpesvirus seropositivity raise important questions about viral reactivation and persistence in ME/CFS pathogenesis, informing future research directions and potential therapeutic targets.
This study does not establish which immune abnormalities are causes versus consequences of ME/CFS, nor does it prove that detected viruses are actively driving the illness rather than simply being reactivated due to immune dysfunction. The lack of healthy control groups means we cannot determine whether these findings are unique to ME/CFS or represent common patterns in other conditions. Correlation between findings does not establish a causal mechanism for ME/CFS onset or progression.
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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