The drugs that stop a small infection from killing you are quietly failing. The World Health Organization now says about one in six confirmed bacterial infections no longer respond to the antibiotics meant to treat them. Some of the most common bacteria, like E. coli, are resistant more than 40 percent of the time. Researchers project that by 2050, drug resistant infections could kill close to 39 million people. It is often called the silent pandemic, because there is no single dramatic moment