Through the Epidemic Intelligence Service (EIS) program of the Centers for Disease Control and Prevention (CDC), NIOSH offers training and experience in all aspects of occupational epidemiology. During two-year assignments, NIOSH EIS officers gain unique experience in the principles and practice of occupational safety and health. NIOSH officers acquire expertise in surveillance and field investigation of occupational diseases and injuries and in epidemiologic research methods. All EIS officers begin their training by attending a three-week introductory course in epidemiology and statistics held in Atlanta during July. EIS officers assigned to NIOSH through CDC's EIS program participate in all EIS activities. NIOSH EIS officers also participate in other EIS activities, including short courses in surveillance and prevention effectiveness and the annual EIS Conference, held in Atlanta each spring. In addition to their NIOSH projects, NIOSH EIS officers may also have an opportunity to participate in investigations of infectious disease outbreaks or other public health emergencies in the United States and internationally.