Whiteside, T L, Friberg, D · The American journal of medicine · 1998 · DOI
This study examines natural killer (NK) cells—white blood cells that help fight infections and abnormal cells—in people with ME/CFS. The researchers found that many ME/CFS patients have lower-than-normal NK cell activity. The study explores why this happens and how it might be related to the disease, while also noting that findings have been difficult to confirm across different studies.
Understanding NK cell dysfunction could help explain why some ME/CFS patients struggle with infections and may lead to better diagnostic markers or treatments. This work bridges cellular immunology with potential neurologic mechanisms, offering a framework for investigating how immune dysfunction contributes to ME/CFS symptoms.
This study does not prove that low NK cell activity causes ME/CFS, only that an association exists in some patients. The inconsistency of findings across studies suggests that NK cell abnormalities may not apply to all ME/CFS patients, and the review cannot establish whether these changes are a primary cause or a consequence of the disease.
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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