Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: The Human Herpesviruses Are Back!
Ariza, Maria Eugenia · Biomolecules · 2021 · DOI
Quick Summary
This review examines whether certain viruses, particularly Epstein-Barr virus (EBV), may play a role in ME/CFS. Earlier research on this topic produced mixed results, leading some scientists to think viruses weren't involved. However, newer research methods have found that specific proteins made by EBV could contribute to immune system and nervous system problems in some ME/CFS patients.
Why It Matters
Finding the cause of ME/CFS is crucial for developing treatments and diagnostic tests. If human herpesviruses do trigger ME/CFS in some patients, this could open new avenues for targeted therapies and help identify which patients might benefit from antiviral approaches.
Observed Findings
- Previous studies produced inconsistent and conflicting results regarding herpesvirus involvement in ME/CFS
- Advanced research methods have now detected specific proteins encoded by EBV in ME/CFS patients
- These viral proteins correlate with immune system abnormalities in a subgroup of ME/CFS patients
- These viral proteins also correlate with neurological abnormalities in a subgroup of ME/CFS patients
- Human herpesviruses may contribute to pathology in only a subset of ME/CFS cases, not all cases
Inferred Conclusions
- Earlier dismissal of herpesvirus involvement in ME/CFS was premature and based on older, less sensitive detection methods
- Specific herpesvirus proteins may trigger immune and neurological dysfunction in a subgroup of ME/CFS patients
- Identifying these viral proteins could lead to the development of specific biomarkers for diagnosis
- Targeted antiviral or immune-modulating therapies might benefit herpesvirus-positive ME/CFS patients
Remaining Questions
- Why do some ME/CFS patients show evidence of herpesvirus involvement while others do not?
- Are specific herpesvirus proteins the primary driver of disease, or do they contribute to pathology triggered by other factors?
- What percentage of the ME/CFS population is affected by herpesvirus-related mechanisms?
- Could antiviral treatments or immune therapies targeting these viral proteins improve outcomes in affected patients?
What This Study Does Not Prove
This review does not prove that herpesvirus infection causes ME/CFS in all patients, nor does it establish that antiviral treatments will be effective. The presence of viral proteins does not necessarily mean they are the primary driver of disease—correlation with abnormal immune responses does not confirm causation. The findings appear relevant only to a subgroup of ME/CFS patients, not the entire ME/CFS population.
Topics
Tags
Metadata
- DOI
- 10.3390/biom11020185
- PMID
- 33572802
- Review status
- Editor reviewed
- Evidence level
- Established evidence from major reviews, guidelines, or evidence maps
- Last updated
- 7 April 2026