Lymphocyte phenotype and function in the chronic fatigue syndrome.
Straus, S E, Fritz, S, Dale, J K et al. · Journal of clinical immunology · 1993 · DOI
Quick Summary
This 1993 study compared immune cells from 18 ME/CFS patients, 10 chronically fatigued patients who did not fully meet diagnostic criteria, and 17 healthy controls. Researchers observed that ME/CFS patients had lower percentages of a type of immune cell called CD4 T cells, and their immune cells showed reduced ability to respond to certain stimuli compared to healthy controls. However, this is a single cross-sectional study from over 30 years ago, and the findings have not yet been replicated in larger, more recent cohorts.
Why It Matters
This early immunological characterization provided detailed phenotypic evidence that ME/CFS is associated with measurable alterations in T-cell composition and function, helping to establish the disease as having an objective biological correlate rather than a purely functional complaint. The finding that similar abnormalities appeared in both CFS and non-CFS chronic fatigue groups raises questions about disease specificity and the heterogeneity of post-infectious fatigue conditions.
Observed Findings
Compared to controls, ME/CFS patients were observed to have reduced percentages of CD4+ T cells and naive (CD4+CD45RA+) T cells.
Memory T cells (CD4+CD45RO+) in ME/CFS patients were observed to express elevated levels of adhesion markers (CD29, CD54, CD58).
ME/CFS patient lymphocytes showed reduced proliferative responses to phytohemagglutinin, concanavalin A, and staphylococcal enterotoxin B compared to controls.
Similar immunological abnormalities were observed in the subgroup of chronically fatigued patients who did not meet full CDC diagnostic criteria.
Inferred Conclusions
The authors propose that peripheral T cells in ME/CFS manifest an increased state of differentiation, suggesting either chronic or recurrent antigenic stimulation.
The authors hypothesise this pattern may arise as a consequence of an underlying neuropsychiatric or neuroendocrine disorder.
Alternatively, the authors propose the changes may reflect exposure to antigens or superantigens from an infectious agent.
The authors note that similar findings in both CFS and non-CFS fatigued patients suggest immune alterations may be common to chronic fatigue syndromes broadly rather than disease-specific.
Remaining Questions
Do these T-cell changes precede symptom onset, or do they develop after illness begins?
What This Study Does Not Prove
This study does not establish whether T-cell changes cause ME/CFS symptoms or arise as a consequence of illness. The cross-sectional design cannot determine temporal sequence or mechanism. The small sample size and lack of longitudinal follow-up mean these findings cannot be generalised to all ME/CFS patients. The study does not identify which specific infectious agent, if any, may be responsible, nor does it establish that any single mechanism drives the observed changes.
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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