Pathological changes of viral pneumonia

From upper respiratory tract infection, airway epithelial extensive damage mucosal ulceration occurred, the membrane lining of fibrin. Airway function to reduce the defense easily lead to bacterial infection, low immune status, the fair merger fungi, protozoa in particular Pneumocystis carinii infection. Simple viral pneumonia caused interstitial pneumonia, a large alveolar interval mononuclear cell infiltration. Alveolar edema, coated with plasma protein and fiber membrane protein transparent, thickened alveolar indemnity from the membrane. Pneumonia can be focal or diffuse widely, and even real change. Alveolar cells and macrophages that virus inclusion. Bronchioloalveolar with exudation. Absorption lesions can be left pulmonary fibrosis, and even nodular calcification.