This article by Heather Boerner previously appeared at TheBody.com, here.
On Jan. 30, 2008, Pietro Vernazza, M.D., was on vacation with his wife, Eva, in the Swiss Alps when his phone rang. It rang again when they got back to their hotel room, and then again the next day. The whole week was taken up with one call after another. When he returned home a few days later, he appeared on Swiss national radio. Days after that, he began what turned into a worldwide tour of public health and professio