Legionnaires’ disease outbreak in Philadelphia in 1976 was mysterious and deadly – 50 years later, scientists know the cause but outbreaks continue

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Legionnaires wait to testify before a special congressional inquiry in November 1976 into the cause of the mysterious disease. Bettmann/Bettman Collection via Getty Images

The landmark Bellevue-Stratford Hotel in Philadelphia went out of business after the Legionnaires’ disease outbreak in 1976. Bettmann/Bettman Collection via Getty Images

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