Abstract
THE 58th annual convention of the American Legion, Department of Pennsylvania, headquartered at the Bellevue-Stratford Hotel in Philadelphia, July 21 to 24, 1976, became an epidemiologic Titanic, inadvertently and tragically encountering an iceberg, which soon came to be known as Legionnaires' disease.1 In the nearly thousand days since this outbreak of febrile respiratory disease, which at the time was of totally unknown cause, remarkable progress has occurred. Investigational efforts have illuminated almost all aspects of the disease: the clinical illness, pathogenesis, epidemiology, microbiology, diagnosis, therapy and prevention. These efforts have resulted in such a number of reports (at least 75 . . .

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