<P> Tuberculosis prevention and control efforts rely primarily on the vaccination of infants and the detection and appropriate treatment of active cases . The World Health Organization has achieved some success with improved treatment regimens, and a small decrease in case numbers . The US Preventive Services Task Force (USPSTF) recommends screening people who are at high risk for latent tuberculosis with either tuberculin skin tests or interferon - gamma release assays . </P> <P> The only available vaccine as of 2011 is Bacillus Calmette - Guérin (BCG). In children it decreases the risk of getting the infection by 20% and the risk of infection turning into disease by nearly 60% . </P> <P> It is the most widely used vaccine worldwide, with more than 90% of all children being vaccinated . The immunity it induces decreases after about ten years . As tuberculosis is uncommon in most of Canada, the United Kingdom, and the United States, BCG is administered to only those people at high risk . Part of the reasoning against the use of the vaccine is that it makes the tuberculin skin test falsely positive, reducing the test's use in screening . A number of new vaccines are currently in development . </P> <P> The World Health Organization declared TB a "global health emergency" in 1993, and in 2006, the Stop TB Partnership developed a Global Plan to Stop Tuberculosis that aimed to save 14 million lives between its launch and 2015 . A number of targets they set were not achieved by 2015, mostly due to the increase in HIV - associated tuberculosis and the emergence of multiple drug - resistant tuberculosis . A tuberculosis classification system developed by the American Thoracic Society is used primarily in public health programs . </P>

The study of resistance to disease is called