The Epidemic Intelligence Service (EIS) is a program of the U.S. Centers for Disease Control and Prevention (CDC). The modern EIS is a two-year, hands-on post-doctoral training program in epidemiology, with a focus on field work. History Creation of the Epidemic Intelligence Service was proposed by Dr. Alexander Langmuir, chief of epidemiologic services, communicable disease center at the U.S. Public Health Service on March 30, 1951. Dr. Langmuir said that it was of utmost importance to planning of appropriate defense measures against biological warfare germs, development of new detection devices, and train laboratory workers for rapid recognition of biological warfare germs. It arose from biological warfare concerns relating to the Korean War. The Epidemic Intelligence Service was organized on September 26, 1951, with the purpose of investigating disease outbreaks that are beyond the control of state and local health departments, enforcement of interstate quarantine regulations, and providing epidemic aid at the request of state health agencies. The Epidemic Intelligence Service's first staff members consisted of 21 medical officers from the U.S. Public Health Service. Background The EIS is operated by the CDC's Center for Surveillance, Epidemiology, and Laboratory Services (CSELS), in the Office of Public Health Scientific Services (OPHSS). Persons participating in the program, known colloquially as "disease detectives", are formally called "EIS officers" (or EIS fellows) by the CDC and have been dispatched to investigate hundreds of possible epidemics created by natural and artificial causes. Since 1951, more than 3,000 EIS officers have been involved in domestic and international response efforts, including the anthrax, hantavirus, West Nile virus in the United States, and the 2014–16 Ebola epidemic in West Africa. EIS officers begin their fellowship with a one-month training program at CDC headquarters in Atlanta, Georgia; however, 95% of their two-year term consists of experiential rather than classroom training. For the remainder of their service, EIS officers are assigned to operational branches within the CDC or at state and local health departments around the country. Placement is determined via a highly competitive matching process. The CDC pairs EIS officers with a Public Health Advisor or "PHA", forming a scientist (EIS officer) and operations (PHA) team. EIS is a common recruiting pathway into the Public Health Service Commissioned Corps. The EIS is the prototype for Field Epidemiology Training Programs (FETP), which operate in numerous countries with technical assistance provided by the CDC. History of responses Since the inception of the