Kazmirchuk, V Ie, Tsaryk, V V, Sydorenko, O I et al. · Likars'ka sprava · 2014
This study examined nearly 5,300 patients with suspected immune problems and found that 7% had abnormally low levels of IgE, an antibody that normally helps fight infections. Among patients with this IgE deficiency, the most common symptoms were recurrent respiratory infections (63%), followed by digestive problems (13%), autoimmune conditions (10%), allergies (7%), and chronic fatigue (7%). The researchers concluded that IgE deficiency is more common than previously recognized and may contribute to various health problems.
Chronic fatigue syndrome appeared in 7% of IgE-deficient patients in this study, suggesting a potential immune dysregulation mechanism relevant to ME/CFS pathophysiology. Understanding the role of IgE in immune regulation and its association with unexplained fatigue may help researchers identify immune subgroups within the ME/CFS population. This work supports investigation of selective immunoglobulin deficiencies as contributors to post-infectious fatigue syndromes.
This study does not prove that IgE deficiency causes ME/CFS—the chronic fatigue cases described may represent coincidental overlap rather than causal relationship. The cross-sectional design cannot establish temporal relationships or rule out reverse causation. The study also does not demonstrate that IgE replacement therapy would improve outcomes in any patient group, including those with fatigue.
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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