1976 Philadelphia Legionnaires' disease outbreak failed. The disease was finally produced in guinea pigs. The CDC announced the discovery at a press conference on January 18, 1977. The bacterium was later named "Legionella pneumophila". "Legionella pneumophila" is the most common cause, but sometimes other species of Legionella bacteria also cause Legionnaires' disease. The terms "Philadelphia fever" and "Legion fever" appear to have been used at the time of the outbreak and for shortly thereafter, although at least one 2008 source which covers disease in a historical narrative sense also included "Legion Fever" as alternate name. Both the World Health Organization in 2018 and the United
Epidemiology of pneumonia Epidemiology of pneumonia Pneumonia is a common illness affecting approximately 450 million people a year and occurring in all parts of the world. It is a major cause of death among all age groups, resulting in 1.4 million deaths in 2010 (7% of the worlds yearly total) and was the 4th leading cause of death in the world in 2016, resulting in 30 million deaths worldwide. Pneumonia is a type of lower respiratory tract infection, and is also the most deadly communicable disease as of 2016. Rates are greatest in children less than five and adults older than 75 years