Masuda, Akinori, Nakayama, Takashi, Yamanaka, Takao et al. · Journal of behavioral medicine · 2002 · DOI
This study compared two types of ME/CFS patients: those whose illness started after an infection and those whose didn't. After multidisciplinary treatment, patients who developed ME/CFS after infection showed better improvement in symptoms and were more likely to return to work. Importantly, a marker of immune function called NK cell activity also showed more improvement in the post-infectious group, suggesting their bodies may respond differently to treatment.
This study suggests that ME/CFS may be a heterogeneous disease with distinct subtypes that respond differently to treatment, which could guide personalized clinical approaches. The observation that post-infectious ME/CFS has better prognosis may help patients and clinicians set realistic expectations and tailor interventions accordingly.
This small observational study does not establish causation for the better outcomes in post-infectious CFS, nor does it prove the underlying mechanisms. The lack of a control group and undefined multidisciplinary treatment make it impossible to determine which specific interventions drove improvements, and results may not generalize beyond this specific population.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Masuda, Akinori, Nakayama, Takashi, Yamanaka, Takao, Koga, Yasuyuki, & Tei, Chuwa (2002). The prognosis after multidisciplinary treatment for patients with postinfectious chronic fatigue syndrome and noninfectious chronic fatigue syndrome.. Journal of behavioral medicine. https://doi.org/10.1023/a:1020475108745
BibTeX
@article{mecfsatlas-masuda-2002-prognosis-after,
author = {Masuda, Akinori and Nakayama, Takashi and Yamanaka, Takao and Koga, Yasuyuki and Tei, Chuwa},
title = {The prognosis after multidisciplinary treatment for patients with postinfectious chronic fatigue syndrome and noninfectious chronic fatigue syndrome.},
journal = {Journal of behavioral medicine},
year = {2002},
doi = {10.1023/a:1020475108745},
note = {PubMed: 12442563},
url = {https://www.mecfsatlas.com/evidence/masuda-2002-prognosis-after},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/masuda-2002-prognosis-after
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