· Pneumonia is the inflammation of the lung tissue.
· Pneumonia can either be primary (to the causing organism) or secondary to pathological damage in the respiratory system
· It occurs in persons of all ages, although the clinical manifestations are most severe in the very young, the elderly, and the chronically ill.
· The most prominent pathogen causing community-acquired pneumonia (CAP) in otherwise healthy adults is S. pneumonia and accounts for up to 75% of all acute cases.
· Other common pathogens include M. pneumoniae, Legionella species, C. pneumoniae, H. influenzae, and a variety of viruses including influenza.
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