Murdoch, J C · The New Zealand medical journal · 1988
This study tested immune system function in 33 ME/CFS patients compared to 33 healthy people of similar age and sex. Researchers used a skin test device called the multitest CMI to measure how well the immune system responded. They found that ME/CFS patients had weaker immune responses than healthy controls, suggesting their T-cells (a key type of immune cell) may not be working normally.
This early study provides objective evidence that ME/CFS involves measurable immune system dysfunction, particularly T-cell abnormalities. Identifying immune system problems helps validate ME/CFS as a biological illness and points researchers toward understanding potential disease mechanisms and exploring immune-targeted treatments.
This study does not prove that T-cell abnormalities cause ME/CFS—only that an association exists. It does not establish whether immune dysfunction is primary to the disease, secondary to chronic illness, or related to other factors like viral infections or stress. The small sample size and single timepoint measurement limit generalizability and do not show whether immune markers change over time or correlate with symptom severity.
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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