E3 PreliminaryPreliminaryPEM not requiredMechanisticPeer-reviewedReviewed
Phylogenetic analysis of short enteroviral sequences from patients with chronic fatigue syndrome.
Galbraith, D N, Nairn, C, Clements, G B · The Journal of general virology · 1995 · DOI
Quick Summary
Researchers looked for enterovirus genetic material in ME/CFS patients and compared it to viruses found in people with acute infections. Using genetic analysis, they found that most of the virus sequences from ME/CFS patients were novel and distinct from known enteroviruses. This suggests that some ME/CFS patients may have persistent enterovirus infections that are different from typical acute infections.
Why It Matters
This work provides molecular evidence supporting the hypothesis that persistent enterovirus infection may play a role in some ME/CFS cases. If validated in larger studies, identifying novel enteroviral sequences could guide future diagnostic and therapeutic approaches targeting chronic viral infection in ME/CFS.
Observed Findings
- 19 of 20 enteroviral sequences from ME/CFS patients were distinct from previously described enteroviruses
- Phylogenetic analysis identified three distinct groupings, with one cluster correlating specifically to CFS diagnosis
- Enteroviral sequences from CFS patients showed close relationships to each other, suggesting a shared origin
- Direct PCR sequencing successfully identified and characterized enteroviral 5'NTR regions from patient samples
Inferred Conclusions
- Persistent enterovirus infection may occur in some ME/CFS patients
- The enteroviral sequences found in CFS patients represent novel variants distinct from acute infection viruses
- Phylogenetic clustering of CFS-associated sequences suggests a specific enteroviral subtype or lineage associated with chronic infection
Remaining Questions
- Do these novel enteroviral sequences persist long-term in ME/CFS patients, and do they replicate or remain latent?
- Are these sequences found in all ME/CFS patients, or only a subset, and what determines susceptibility to persistent infection?
- Do these novel enteroviruses directly contribute to ME/CFS pathology, or are they a consequence of altered immune function in affected individuals?
What This Study Does Not Prove
This study does not prove that enterovirus infection causes ME/CFS—it only demonstrates an association in the samples tested. It does not establish whether viral persistence is a primary cause, a consequence of immunodeficiency, or merely a bystander in disease pathogenesis. The study also does not rule out the possibility that these sequences represent laboratory artifacts or contamination.
Tags
Symptom:Fatigue
Biomarker:Blood BiomarkerGene Expression
Phenotype:Infection-Triggered
Method Flag:Weak Case DefinitionNo ControlsSmall SampleExploratory Only
Metadata
- DOI
- 10.1099/0022-1317-76-7-1701
- PMID
- 9049375
- Review status
- Editor reviewed
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 12 April 2026
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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