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Are there specific immune cell signatures in Myalgic encephalomyelitis/chronic fatigue syndrome?

moderate confidence  ·  Last reviewed November 5, 2026

Research into myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) suggests that the condition involves significant immune dysregulation. Scientists are looking for specific markers and cell behaviors to better understand the underlying biology of the disease.

What the research says

A study using multiparameter flow cytometry to analyze blood cells found distinct immune signatures in people with ME/CFS compared to healthy individuals. Specifically, those with ME/CFS showed reduced expression of costimulatory molecules and impaired immune cell trafficking mediated by CCR7. These findings suggest that the immune system in ME/CFS may be in a state of suppression 4.

In contrast, other conditions like long COVID showed different patterns, such as increased immune activation and signs of immune exhaustion 4. Additionally, some research suggests that immune dysregulation may be a shared mechanism between ME/CFS and other conditions, such as irritable bowel syndrome 1. Other research into the broader category of post-acute infection syndromes (which includes ME/CFS) highlights the importance of identifying biomarkers and pathomechanisms to improve diagnosis and find treatment targets 2.

What to ask your doctor

  • What specific immune markers or cell types are most commonly associated with ME/CFS?
  • How does the immune system in ME/CFS differ from other post-viral conditions like long COVID?
  • Are there specific blood tests available to check for immune dysregulation or inflammation?
  • How do these immune findings impact the development of potential treatments?

This question is drawn from common patient questions about Neurology and answered using cited medical research. We do not provide individualized advice.