How two different types of immune cells help two billion people keep tuberculosis in check

More than 10 million people are sickened by tuberculosis (TB) globally each year, resulting in 1.5 million deaths. Yet, as many as two billion people are infected with Mycobaterium tuberculosis, the bacterium that causes tuberculosis, and are otherwise healthy and asymptomatic. Scientists who study TB look at those individuals who can tolerate and contain the infection in hopes of developing better treatments and vaccines.