Multidrug-resistant TB, or MDR-TB, which experts have dubbed "airborne cancer," is the latest superbug you probably haven't heard of. Standard tuberculosis drugs don't work on MDR-TB, and only about 10 percent of people with MDR-TB worldwide are treated effectively. The other 90 percent spend what remains of their lives spreading the deadly bacteria to people around them. There were about 480,000 cases of MDR-TB globally in 2013, including about 100 in the United States. Seventy-five million additional people will lose their lives over the next 35 years as a result of MDR-TB, a United Kingdom government report predicted.