Mark Frauenfelder interviews Maryn McKenna, author of Superbug, a book about MRSA (Methicillin Resistant Staphyoloccus Aureus), which "kills more people every year than AIDS":

I talk to doctors every week who tell me that they have had a patient in a medical center for whom literally nothing worked. It was, for them, essentially back to the pre-antibiotic era. And they have to tell families "I'm sorry, but here we are in the midst of this enormously technological medical center and I have nothing that can help your family member." It's stunning. It's something you can't believe could happen in the 21st century, and yet it does.

We want to hear what you think about this article. Submit a letter to the editor or write to