Pedersen, Maria, Asprusten, Tarjei Tørre, Godang, Kristin et al. · Brain, behavior, and immunity · 2019 · DOI
This study followed 200 teenagers who had an acute Epstein-Barr virus (EBV) infection to see which factors predicted who would develop lasting fatigue six months later. Researchers measured many baseline characteristics including pain sensitivity, mood, memory, physical activity level, and blood markers like vitamin B12 and inflammation levels. They found that fatigue six months after EBV was most strongly predicted by things like sensory sensitivity, pain, anxiety, and how active the teenager was—rather than by immune system markers alone.
Understanding which baseline characteristics predict who develops prolonged fatigue after EBV infection could help identify adolescents at higher risk and enable early intervention. This work challenges the assumption that post-viral fatigue is driven primarily by immune dysfunction, suggesting instead that sensory processing, mood, and functional capacity are key—findings that could reshape prevention and treatment strategies for ME/CFS.
This study identifies statistical associations between baseline characteristics and later fatigue, but does not prove causation or that these factors directly cause ME/CFS development. The six-month timeframe also does not establish whether these predictors remain relevant in the longer-term progression of ME/CFS, and the study was not powered to distinguish CFS cases specifically from other post-viral fatigue presentations.
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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