Evolution of the concept of surveillance in the United States.
D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology*; D004470:Economics, Medical; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology; D008288:Malaria / Q000453:epidemiology; D008297:Male; D011051:Poliomyelitis / Q000453:epidemiology; D011159:Population Surveillance; D014481:United States