Bird fancier lung

**Definition:** Bird fancier lung, also called Pigeon-breeder's lung disease, is an allergic alveolitis caused by inhalation of particulate avian emanations, sometimes specified by avian species. Presentation can be acute with chills, cough, fever, shortness of breath, chest tightness usually resolving within 24h after cessation of antigen exposure, sub-acute with cough and dyspnoea over several days to weeks, whereas chronic form results in breathlessness, coughing, lack of appetite and weight loss.