Kowal, Krzysztof, Schacterele, Richard S, Schur, Peter H et al. · Allergy and asthma proceedings · 2002
This study tested 50 ME/CFS patients for allergies by measuring specific immune proteins called allergen-specific IgE in their blood. Contrary to earlier patient surveys suggesting very high allergy rates, only 36% of ME/CFS patients had detectable allergic antibodies to common allergens like dust mites, pollen, and foods. This rate was similar to what researchers find in the general healthy population, suggesting that allergies may not be uniquely associated with ME/CFS.
Many ME/CFS patients anecdotally report allergic symptoms, and earlier surveys claimed very high atopy prevalence (up to 80%), which could have influenced patient management and expectations. This controlled laboratory study using objective testing challenges that assumption, suggesting that true allergen sensitization may not be a defining feature of ME/CFS and that perceived allergies could reflect other mechanisms.
This study does not prove that allergies play no role in individual ME/CFS patients' symptoms—only that allergen-specific IgE prevalence is not uniquely elevated in the cohort as a group. It does not assess non-IgE-mediated allergic or intolerance mechanisms, mast cell activation, or whether documented sIgE positivity correlates with symptom severity or flares in ME/CFS. The cross-sectional design cannot establish temporal relationships or causation.
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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