THE question " What are the essentials of typhoid fever control today? " carries with it the implication that these essentials are no longer the same as formerly. Although our fundamental conceptions as to the cause and mode of transmission of typhoid fever remain the same, the problem of control is materially different from that of a generation or even a decade ago because of the changes which have taken place in the prevalence of the disease. Since these changes have a direct relationship to prevention, they will be discussed briefly before reviewing the present status of typhoid control. TYPHOID PREVALENCE The trend of typhoid mortality during the past 20 years in 11 states, 6 of them in the northern, and 5 in the southern part of the country, is shown in Table I and in the accompanying graph. The northern states are Connecticut, New Hampshire, Maine, Michigan, Minnesota, and Wisconsin, and the southern states include Kentucky, Maryland, North Carolina, Tennessee, and Virginia.* Populations and deaths for places of less than 10,-000 population in North Carolina in 1913, and for the State of Tennessee from 1913 to 1916 inclusive, are not *Read before a Joint Session of the Health Officers, Laboratory, and Epidemiology Sections of the American Public Health Association at the Sixty-second Annual Meeting in Indianapolis, Ind., October 10, 1933.