People used to believe that infection is a killer of the past. This is incorrect because research shows that our big killers from cancers, diabetes, heart disease and dementia are largely infection driven. It is difficult to find a pathology that does not have an associated infection. Many viral infections can be stealth, hidden from our awareness and create immunological havoc. Microbes in the fermenting gut drive gut tumours, psychiatric disease and arthritis. Sarah Myhill ,MD, is a genius at putting the tools for recovery into the hands of the patient. She discusses her latest book, 'The Infection Game' and the role of microbes, mitochondria, diet and rest in healing. A healthy endocrine function is essential to winning the aeons long battle between humanity and all those bugs that regards us as lunch.