Peterson, P K, Schenck, C H, Sherman, R · Minnesota medicine · 1991
This study looked at 135 people in Minnesota with ME/CFS to understand who gets the disease and how it develops. Most patients reported that their illness started suddenly with what looked like an infection, and fatigue was their worst symptom. When researchers checked in with some patients a year later, none had fully recovered, though about 40% felt somewhat better.
This early study provided important epidemiological data on ME/CFS in a defined geographic population, documenting the infectious onset pattern and chronicity of symptoms. It demonstrated that most patients experience persistent illness over years, supporting ME/CFS as a serious long-term condition requiring ongoing clinical attention.
This study does not establish causation between the reported infections and ME/CFS development—it only documents the temporal association. The cross-sectional design cannot determine what factors predict recovery or long-term outcomes. The study does not identify which specific infections may trigger ME/CFS or explain the mechanisms of symptom improvement.
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
Peterson, P K, Schenck, C H, & Sherman, R (1991). Chronic fatigue syndrome in Minnesota.. Minnesota medicine. https://pubmed.ncbi.nlm.nih.gov/1861659/
BibTeX
@article{mecfsatlas-peterson-1991-chronic-fatigue,
author = {Peterson, P K and Schenck, C H and Sherman, R},
title = {Chronic fatigue syndrome in Minnesota.},
journal = {Minnesota medicine},
year = {1991},
note = {PubMed: 1861659},
url = {https://www.mecfsatlas.com/evidence/peterson-1991-chronic-fatigue},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/peterson-1991-chronic-fatigue
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