From Name: From Email: To Name: To Email: Optional Message: Vaccine shows promise for preventing active TB disease from The Associated Press via U.S. News & World Report An experimental vaccine proved 50% effective at preventing latent tuberculosis infection from turning into active disease in a three-year study of adults in Africa. Doctors were encouraged because protection declined only a little after two years, and even a partially effective vaccine would be a big help against TB. The lung disease kills more than a million people a year, mostly in poor countries, and about one-third of the world's people harbor the bacteria that cause it. more 7701 Las Colinas Blvd., Ste. 800, Irving, TX 75063