Rasmussen, A K, Andersen, V, Nielsen, H et al. · Ugeskrift for laeger · 1994
This 1994 review examined what scientists knew about ME/CFS at that time, looking at whether a persistent virus or immune system problem caused the condition. The authors found that existing research did not consistently support either explanation, and that different studies often contradicted each other. They concluded that more careful research was needed to understand what actually causes ME/CFS and how to tell it apart from other illnesses.
This editorial highlights a critical problem in ME/CFS research: inconsistent and sometimes contradictory findings across studies. For patients, this underscores why a clear diagnosis and understanding of the disease mechanism remained elusive even after years of research. For researchers, it identifies the urgent need for standardized diagnostic criteria and more rigorous methodology to establish reproducible biological markers.
This editorial does not prove that viral infection or immune dysfunction play no role in ME/CFS—it only notes that available evidence was inconsistent and inconclusive. The authors do not present new experimental data, so their conclusions reflect the state of the literature rather than definitive negative findings. This review cannot establish what the true cause of ME/CFS actually is.
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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