PNEUMONIA Pneumonia is defined as acute inflammation of the lung parenchyma distal to the terminal bronchioles (consisting of the respiratory bronchiole, alveolar ducts, alveolar sacs and alveoli). Causes 1.Inhalation of the microbes present in the air 2.Aspiration of organisms from the nasopharynx or oropharynx. 3.Haematogenous spread from a distant focus of infection. 4.Direct spread from