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Causative agent of fibrotic hypersensitivity pneumonitis (fHP) grouped by source (n=211). Information on the potential causative agent of fHP was available in 211 patients. In almost half of these, a causative antigen could not be identified (49%, n=104/211). Avian proteins (birds n=31, feather bedding/duvet n=16) and mould exposure (n=21) were the the most common identified antigens.
