Serologic and immunologic responses in chronic fatigue syndrome with emphasis on the Epstein-Barr virus.
Jones, J F · Reviews of infectious diseases · 1991 · DOI
Quick Summary
This review examined whether ME/CFS is connected to Epstein-Barr virus (EBV), the virus that causes mono. Researchers found that people with ME/CFS had higher levels of antibodies to EBV compared to healthy people, but this doesn't prove the virus causes the disease. They also found that immune cells called natural killer cells—which help fight infections—work differently in ME/CFS patients, though the findings varied between studies.
Why It Matters
This work is important because it synthesized early evidence about immune abnormalities in ME/CFS and identified EBV as a potential biological marker worthy of further investigation. For patients, establishing objective biological markers could help with diagnosis and legitimacy of the condition. The identification of natural killer cell dysfunction as a consistent abnormality has shaped decades of subsequent immunological research in ME/CFS.
Observed Findings
Mean antibody titers to EBV viral capsid antigen and early antigen are higher in CFS patients than in healthy controls
Serial (longitudinal) samples show clearer differences in EBV antibody levels between CFS patients and controls
Natural killer cell number and function vary considerably between different CFS studies
Virus isolation rates from saliva do not differ between CFS patients and healthy controls
One large comparison study found more EBV-infected lymphocytes in CFS patients than in controls
Inferred Conclusions
Chronic active EBV infection may be associated with CFS, but the relationship is not yet established
Immune dysfunction, particularly in natural killer cells, may be a feature of CFS
Standardized diagnostic criteria and laboratory methods are needed to clarify which immune abnormalities are specific to CFS
Multiple viruses, including EBV and Coxsackie B, warrant investigation as potential contributors to CFS
Remaining Questions
Does elevated EBV antibody represent true chronic active infection or simply reactivation without disease causation?
What This Study Does Not Prove
This review does not prove that EBV causes ME/CFS; elevated antibodies could reflect either chronic infection, reactivation, or an unrelated immune abnormality. The variable findings across studies mean no single immune marker has been definitively established as diagnostic. Correlation between EBV serology and ME/CFS does not establish mechanistic causation.
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 →