Two new tuberculosis studies provide good news and bad news about the bacterium that infects nearly a third of the world's population and a disease that kills nearly 2 million people each year. The good news: A type of blood pressure medication shows promise at overcoming some drug-resistant tuberculosis, at least in the laboratory. The bad news: The Mycobacterium tuberculosis bacterium, which causes the disease, might be resistant to treatment in more people than previously thought.