Legionnaires' disease that occur globally is not known. Legionnaires' disease is the cause of an estimated 2-9% of pneumonia cases that are acquired outside of hospital. An estimated 8,000 to 18,000 cases a year in the United States require hospitalization. Outbreaks of disease account for a minority of cases. While it can occur any time of the year, it is more common in the summer and fall. The disease is named after the outbreak where it was first identified, at a 1976 American Legion convention in Philadelphia. The length of time between exposure to the bacteria and the appearance of symptoms is
American Legion Nation. In addition to Boys State, The American Legion features numerous programs including American Legion Baseball, Scouting, Oratorical Contests, Junior Shooting Sports, Youth Alumni, Sons of the American Legion, American Legion Riders, and Scholarships at every level of the organization. The organization's official publication in its initial phase was a magazine called "The American Legion Weekly," launched on July 4, 1919. This publication switched its frequency and renamed itself "The American Legion Monthly" in 1926. In 1936 the publication's name and volume numbering system changed again, this time to "American Legion Magazine." The main American Legion Headquarters is located on