Parras, F, Salvá, F, Reina, J et al. · Medicina clinica · 1989
This study describes a patient who developed chronic fatigue syndrome (CFS) after a confirmed Epstein-Barr virus (EBV) infection. EBV is a common virus that usually causes infectious mononucleosis ("mono"), but this patient went on to experience lasting fatigue, loss of appetite, low-grade fever, and mood changes long after the acute infection. The authors emphasize that diagnosing CFS based on symptoms alone can be risky and may lead to misdiagnosis of other serious conditions.
This early case documentation is historically important as it represents one of the first formal clinical descriptions linking acute EBV infection to the development of CFS, contributing to emerging recognition of post-viral fatigue syndromes. The authors' caution about diagnostic rigor remains relevant, as accurate diagnosis is essential for appropriate patient management and research validity. Understanding potential viral triggers for CFS is important for both patients seeking answers about their illness onset and for researchers investigating disease mechanisms.
This single case report does not establish that EBV causes CFS in most or all patients, nor does it prove a causal mechanism—only that this patient's CFS followed EBV infection temporally. The study does not determine what percentage of EBV-infected individuals develop CFS, nor does it rule out other contributing factors. The findings cannot be generalized beyond this individual case without larger systematic studies.
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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