As bacteria evolve to become more resistant to antibiotics, dangerous infections are taking their toll on human lives. We hear from John Haverty who, after knee replacement surgery generated an unrelenting infection … found himself facing amputation of his leg. Enter a new treatment called 'phage therapy' and Greg Merril, CEO and co-founder of Adaptive Phage Therapeutics in Gaithersburg. He explains how phages devour bacteria and the treatment that ultimately saved Haverty’s leg.