In the United States alone, 1.25 million people suffer from type 1 diabetes. A vaccine used over 100 years ago for tuberculosis (bacillus Calmette-Guerin ) has shown promise in reversing this disease. This vaccine is now commonly used for treating bladder cancer and is considered to be safe. An announcement made yesterday at the 75th Scientific Sessions of the American Diabetes Association said that the FDA will test the vaccine on 150 people who are in an advanced stage of type one diabetes. The body of a person with type 1 diabetes does not produce insulin due to the immune system destroying the cells that create insulin. T cells are produced, and these cells create problems in the pancreatic islets, where insulin is produced. The vaccine works by eliminating these T cells.