The US city is successfully combating chronic disease through community engagement, policies and measuring impact results As part of the investment in security surrounding the Olympics in London, the Health Protection Agency has been touting a state-of-the-art disease surveillance system promising real-time collection and analysis of health-related data to detect threats as early as possible. It tracks flu symptoms, rashes, vomiting, double vision, and other symptoms of infectious diseases. The effort is laudable, and it makes good sense for an event as big as the Games. But, when the Olympics...