The word germ is defined as 'a microbe that causes disease'. The vast majority of microbes do not infect us at all: it is pathogens that make us ill. These include bacteria, viruses, protozoa, fungi, worms, and prions. Living with Germs not only looks at all of these in detail, but also at the defense mechanisms by which we come to terms with pathogens, whether by eliminating them, stopping them from eliminating us, or simply learning to live with...