A multicenter virome analysis of blood, feces, and saliva in myalgic encephalomyelitis/chronic fatigue syndrome.
Briese, Thomas, Tokarz, Rafal, Bateman, Lucinda et al. · Journal of medical virology · 2023 · DOI
Quick Summary
Researchers looked for viruses in blood, saliva, and stool samples from ME/CFS patients and compared them to healthy people. They used advanced testing methods to search for viral genetic material but found no consistent differences between the two groups, except that ME/CFS patients had fewer anelloviruses (a common, typically harmless virus). This suggests that if viruses play a role in ME/CFS, the problem may not be the presence of the virus itself, but rather how the body's immune system responds to it.
Why It Matters
Since many ME/CFS patients report viral triggers for their illness, understanding whether persistent viruses play a role is crucial. This study's finding that viruses aren't consistently present suggests researchers should investigate immune system dysfunction rather than just looking for viruses, potentially opening new treatment pathways.
Observed Findings
No consistent group-specific differences in viral nucleic acid detection between ME/CFS patients and healthy controls across blood, feces, and saliva samples.
Lower prevalence of anelloviruses detected in ME/CFS cases compared to healthy controls.
Multicenter sample collection and high-throughput sequencing were employed to increase sensitivity and representativeness.
Inferred Conclusions
Viral persistence detectable in standard body fluid compartments is not a primary characteristic distinguishing ME/CFS patients from healthy individuals.
Future virology research in ME/CFS should prioritize investigation of adaptive immune responses rather than continued surveillance for viral gene products.
If viruses contribute to ME/CFS pathogenesis, the mechanism likely involves immune dysregulation rather than chronic active infection.
Remaining Questions
Why do some ME/CFS patients respond to antiviral treatments if persistent viruses are not consistently detected?
Are there tissue-specific viral infections (e.g., in the nervous system or muscle) not captured by blood, saliva, and stool sampling?
Does anellovirus depletion in ME/CFS patients reflect immune dysfunction, and does restoring anellovirus levels have therapeutic implications?
What This Study Does Not Prove
This study does not prove that viruses do not cause ME/CFS—it only shows they are not consistently detectable in blood, saliva, and stool. The study cannot exclude viruses hiding in other tissues, nor does it address whether past viral infections (even if cleared) trigger ongoing immune abnormalities. It also does not explain why some patients improve with antiviral medications.