sentences:  Chills, fever, non-productive cough and chest discomfort may also occur.Upon re-exposure to avian proteins, sensitized individuals will typically experience symptoms within 4–6 hours or sooner.In the chronic form there is usually anorexia, weight loss, extreme fatigue and progressive pulmonary fibrosis, which is generally the most serious consequence of the disease because it irreversibly and increasingly diminishes the lungs' efficiency over time.