Every year on March 24, World Tuberculosis (TB) Day is observed to commemorate the discovery of the etiological agent of this disease, the bacterium Mycobacterium tuberculosis by noted German physician and microbiologist and Nobel Laureate, Robert Koch (1843-1910). The infection occurs via inhalation of the air-borne bug; therefore, the disease primarily affects the lungs, but it can spread to other parts of body as well, such as the central nervous system (brain and spinal chord), bone, and internal organs. If adequate treatment is not instituted (and sometimes despite therapy), a person with active TB disease will likely die. In the United States, in 2010 (the latest year for which statistics are currently available), of the nearly nine hundred deaths in which TB was suspected, TB was confirmed in roughly 4 out of 10 cases, and a total of 569 people died from TB. Globally, in 2012, an estimated 8.6 million people contracted TB, of which 1.3 million died.