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The "New" Pneumonias: The Doctor's Dilemma

Ann Intern Med. 1980;92(4):559-561. doi:10.7326/0003-4819-92-4-559
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The outbreak of Legionnaires' disease in Philadelphia in 1976 (1) and the definition of its epidemiology and etiologic agent, Legionella pneumophila, a gram-negative bacillus, have stimulated new interest in and study of several etiologically obscure infections that have usually presented as pneumonia but, in some instances, also as extrapulmonary syndromes. Some of these pneumonias have been considered "new," but it is becoming clear that most, if not all, of them have been known as clinical entities for many years. The truly new feature is identification of their specific etiologic agents, a group of gram-negative bacilli. This is exemplified by the




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