Farmer's lung disease (FLD) is the most frequent occupational hypersensitivity pneumonitis. In the East of France and Finland, various genera of mold (Aspergillus, Absidia = Lichtheimia, and Wallemia) have been suggested as the main causative agents of FLD. 1 and 2 Immunologic studies have also shown that sera from patients with FLD specifically react with Aspergillus species from the glaucus group (Aspergillus vitis/Eurotium amstelodami). 1