Centers for Disease Control (CDC) in the United States: 50 years.
D002487:Centers for Disease Control and Prevention, U.S. / Q000266:history*; D003141:Communicable Diseases / Q000266:history; D004813:Epidemiology / Q000266:history; D049673:History, 20th Century; D006801:Humans; D011159:Population Surveillance; D014481:United States