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, acute infection of one or both lungs that can be caused by a bacterium, usually Streptococcus pneumoniae (also called pneumococcus; see streptococcus), or by a virus, fungus, or other organism.
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lobular pneumonia, a form of lung inflammation characterized by affection of the smallest bronchi and by transmission of the inflammatory process to the lung tissue. The inflammatory process in bronchopneumonia is focal in character. Bronchopneumonia may be a manifestation of several infections (influenza, plague, tularemia, and others); it may also be a complication of noninfectious diseases (myocardial infarct, tumors, and so forth).