Why is the world losing the fight against history's most lethal disease?

Tuberculosis has killed more people than any other disease in history. Last year, 1.5 million people died from TB and 10 million more acquired it. A shocking one-quarter of the world’s population is infected. That’s not much better than 1993, when one-third of the world was infected and the World Health Organization declared TB a global emergency. We are losing the battle.