There are more than 8 million new tuberculosis infections every year—virulent new drug-resistant strains emerging faster than ever, outbreaks occurring across the world, and TB has become the second leading cause of death from an infectious disease on the planet. Jezza Neuman, producer, writer, and director of the new Frontline documentary “TB Silent Killer,” talks about traveling to Swaziland, the country with the world's highest incidence of TB, to create a portrait of the people living at the pandemic's epicenter. “TB Silent Killer” airs March 25 at 10 pm on PBS.