[Humidifier fever: and unusual variant of hypersensitivity pneumonitis].

A case of a patient suffering three episodes consistent in fever, lung infiltrates, lymphocitosis in bronchoalveolar lavage and non-caseificant granulomata in transbronchial biopsy is reported.A relationship between exposition to the air conditioner in the office and the clinical picture was stablished, and the patient was finally diagnosed from humidifiers fever. We enfatize the manifestations of this uncommon disease, probably infradiagnosed, and the patogenic mechanisms are reviewed.