Dickson D. Despommiers vivid, visceral account of the biology, behavior, and history of parasites follows the interplay between these fascinating life forms and human society over thousands of years. He focuses on long-term host-parasite associations, which have evolved to avoid or even subvert the human immune system. Some do great damage to their hosts, while others have signed a kind of peace treaty in exchange for their long lives within them. They also, Despommier shows as he discusses these organisms with the reader, practice clever survival strategies that doctors hope to mimic as they undertake treatments for Crohns disease, food allergies, type 1 diabetes, organ transplantation, and other as yet unsolved medical challenges.Despommier concentrates on particularly remarkable and often highly pathogenic organisms, describing their life-cycles and the mechanisms they use to avoid elimination. He details their attack and survival plans and the nature of the illnesses they cause in general terms, enabling readers of all backgrounds to steal a glimpse into the secret work of such effective invaders. He also points to the cultural contexts in which these parasites thrive and reviews the current treatments available to defeat them. Encouraging scientists to continue to study these organisms even if their threat is largely contained, Despommier shows how closer dissection of the substances parasites produce to alter our response to them could help unravel some of our most complex medical conundrums.