I read this book in college back in the mid-90s as part of my medical anthropology course list and was entranced by its implications immediately. It is one of my favorite nonfiction books to this day. My eager mind soaked up the ideas and theories Ewald was espousing and I became a devoted believer in the power of vectors, genetics, and bio-organisms to deliver sickness, death, and even disease immunity to humanity. This was powerful stuff at the time...and still is in many circles. But it is no longer as theoretical in the strictest sense. The medical and scientific communities seem to be catching on, (but this is more a general sense that a conclusion drawn from exhaustive research). Ewald's a genius in my mind for basically starting the field of evolutionary medicine. A Google Scholar search reveals over 15,000 results ("paul ewald infectious disease").
Highly recommended for those interested in epidemiology, disease and illness, clinical implications, genetics, and evolutionary pressures to survive and reproduce. Some have said it was overly technical, but other reviewers have said it was written in plain language. Nonetheless, it contains tons of research and is not a light summer read. I found it to be well-written, easy-to-follow and wholly awe-inspiring.