Levy, J A · Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 1994 · DOI
This review explores whether viruses might cause ME/CFS. Researchers found that while many different viruses have been suspected, no single virus has been proven to be the cause. However, studies show that people with ME/CFS have immune system abnormalities—particularly problems with cells that fight infection—suggesting their body may be stuck in an overactive response to a virus they once had or still have.
This study was influential in establishing that ME/CFS likely involves an abnormal immune response rather than active viral infection alone. Understanding this mechanism is crucial for developing targeted treatments that might help reset the immune system rather than simply searching for a single viral culprit.
This review does not prove that any specific virus causes ME/CFS, nor does it establish that viruses are the sole cause of the disease. The study identifies associations and immune abnormalities but cannot determine causation from the evidence reviewed. It also does not explain why some people recover after viral illness while others develop persistent ME/CFS.
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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