When members of the Pennsylvania American Legion gathered in Philadelphia on July 21, 1976, they were unaware that their organization’s annual conference would enter the epidemiological history books. America was in a celebratory mood that month. The country had just marked the bicentennial of the nation’s founding, and Philadelphia, as a leading player in the […] The post Legionnaires’ Disease Surfaced 50 Years Ago. It’s Still Killing People. appeared first on Circle of Blue .