Legionnaires’ disease outbreak in Philadelphia in 1976 was mysterious and deadly – 50 years later, scientists know the cause but outbreaks continue
June 19, 2026
Charles Haas, PsyD, LD Betz Chair professor of environmental engineering, and Robert Promisloff, DO, a clinical professor emeritus of medicine in the Division of Pulmonary & Critical Care Medicine, co-authored a June 19 column for The Conversation about the Legionnaires’ disease outbreak 50 years ago in Philadelphia and how scientists know the cause but outbreaks continue.
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