TB and HIV/AIDS Factsheet, January 28, 2008: “Tuberculosis (TB) is a disease that is spread from person to person through the air. This disease is particularly dangerous for persons infected with HIV. Worldwide, TB is a leading cause of death among persons infected with HIV…Worldwide – At the end of 2007, approximately 33.2 million persons were living with HIV infection…In the United States, approximately 1 million persons were living with HIV infection at the end of 2003. As many as 25% of infected persons are unaware of their infection.”