Gupta, S, Vayuvegula, B · Scandinavian journal of immunology · 1991 · DOI
Researchers compared immune system cells and antibodies in 20 ME/CFS patients and 20 healthy people to see if there were differences. They found that ME/CFS patients had fewer natural killer cells (immune cells that fight infections), some changes in how their immune cells communicate with each other, and weaker responses to certain types of immune challenges. These findings suggest the immune system works differently in ME/CFS.
This study provides early evidence that ME/CFS involves measurable immune dysfunction rather than being purely psychological, which was controversial in the 1990s. Identifying specific immune abnormalities—particularly natural killer cell deficiency and impaired antigen responses—helps establish biological markers that could eventually support diagnosis and guide treatment development.
This study does not prove that immune abnormalities *cause* ME/CFS or that correcting them will resolve the disease. Cross-sectional comparison cannot determine whether observed immune changes are primary drivers of ME/CFS or secondary consequences of chronic illness. The elevated anti-HHV-6 antibodies do not prove HHV-6 causes ME/CFS, only that exposure or reactivation may be more common.
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
Gupta, S & Vayuvegula, B (1991). A comprehensive immunological analysis in chronic fatigue syndrome.. Scandinavian journal of immunology. https://doi.org/10.1111/j.1365-3083.1991.tb01777.x
BibTeX
@article{mecfsatlas-gupta-1991-comprehensive-immunological,
author = {Gupta, S and Vayuvegula, B},
title = {A comprehensive immunological analysis in chronic fatigue syndrome.},
journal = {Scandinavian journal of immunology},
year = {1991},
doi = {10.1111/j.1365-3083.1991.tb01777.x},
note = {PubMed: 1849315},
url = {https://www.mecfsatlas.com/evidence/gupta-1991-comprehensive-immunological},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/gupta-1991-comprehensive-immunological
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