A 34-year-old previously healthy man was seen at this hospital after a two-week history of high temperature and mild nonproductive cough. He had kept four parakeets, one of which had been weak recently. A roentgenogram of the chest showed consolidation in the right lower lung field. TBLB from rS8 revealed alveolar macrophages, lymphocytes and fibrin which were found within the alveoli mainly and the alveolar lining cells were swollen. There was a slight increase of mononucler leucocytes within the interstitial spaces. Bronchoalveolar lavage cellular constituents showed alveolar macrophage 71%, neutrophil 27%, lymphocyte 1%, respectively. We could isolate organisms from the bowel and faeces of his parakeet revealing C. psittaci by Giemsa stain.