Tuberculosis (TB) is a global disease, found in every country in the world. It is the LEADING infectious cause of death worldwide. The World Health Organization estimates that 1.8 billion people—close to one quarter of the world's population—are infected with Mycobacterium tuberculosis (M.tb), the bacteria that causes TB. Last year, 10 million fell ill from TB and 1.5 million died. Tuberculosis kills five thousand people every day. TB is an airborne disease that can be spread by coughing or sneezing and is the leading cause of infectious disease worldwide.