You've heard it before, how the pharmaceutical industry has a giant "revolving door" through which corporations and government agencies frequently exchange key employees. That reality was driven home in a huge way today when news broke that Dr. Julie Gerberding, who headed the CDC from 2002 through 2009, landed a top job with Merck, one of the largest drug companies in the world. Her job there? She's the new president of the vaccine division. How convenient. That means the former head of the CDC was very likely cultivating a relationship with Merck all these years, and now comes the big...