Epidemiologists determine the frequency and pattern of health problems in different communities.
In other words, they find out who has a specific health problem, how the problem occured, and where the problem occured. Using the information about who, when, and where epidemiologists try to determine why the health problems occur. Public health officials use epidemiological information to design, prevent, and control the diseases in the community. By finding those at risk for a specific health problem, epidemiologists can target their prevention and control strategies at people who are at risk. This course examines recent trends in TB in the United States and describes groups at high risk for TB infection and TB disease.