Cottle, L E, Mekonnen, E, Beadsworth, M B J et al. · QJM : monthly journal of the Association of Physicians · 2012 · DOI
This UK study looked at 115 patients who were referred to a specialist clinic because doctors suspected they had Lyme disease. The researchers found that only 23% actually had Lyme disease, while about one-third had ME/CFS instead. Importantly, some ME/CFS patients had been incorrectly told they had Lyme disease by non-specialist doctors, leading them to take unnecessary antibiotics.
This study highlights a critical diagnostic problem: ME/CFS patients are being misdiagnosed with Lyme disease in non-specialist settings, resulting in unnecessary antibiotic treatment and delayed appropriate management. The data provide evidence that ME/CFS and Lyme disease are being conflated despite distinct diagnostic criteria, which has direct implications for patient care pathways and treatment access.
This study does not prove that Lyme disease never causes ME/CFS-like symptoms, nor does it establish that antibiotics are never appropriate for any of these patients. Being a retrospective case note review, it cannot determine causality or establish whether misdiagnosed patients experienced harm from delayed appropriate care. The findings are specific to one UK region and may not generalise to other healthcare systems.
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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