Review ". . .Ewald's enthusiasm for his topic reaches out to the reader from every page. . . . Ewald's book will arouse considerable interest. The topic is important and is presented in a palatable form that will appeal to a wide readership."--Politics and the Life Sciences "Paul Ewald, an evolutionary biologist at Amherst College, argues that HIV may have infected people benignly for decades, even centuries, before it started causing AIDS....The idea may sound radical, but it's not just flashy speculation. It reflects a growing awareness that parasites, like everything else in nature, evolve by natural selection."--Newsweek "[Ewald] infects both students and colleagues with his enthusiasm."--U.S. News and World Report "Of interest to professionals in health science, epidemiology, and evolutionary biology, but also accessible to general readers."--SciTech Book News "Important...The arguments in this book are well supported by data. The references are germane, including classical articles and current literature. The book is well written and deserves the attention of biologists, health scientists, and enlightened planners."--The Quarterly Review of Biology Product Description Findings from the field of evolutionary biology are yielding dramatic insights for health scientists, especially those involved in the fight against infectious diseases. This book is the first in-depth presentation of these insights. In detailing why the pathogens that cause malaria, smallpox, tuber