At War Within

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In the seventeenth century, smallpox reigned as the world's worst killer. Luck, more than anything else, decided who would live and who would die. That is, until Lady Mary Wortley Montagu, an English aristocrat, moved to Constantinople and noticed the Turkish practice of "ingrafting" orinoculation, which, she wrote, made "the small- pox...entirely harmless." Convinced by what she witnessed, she allowed her six-year-old son to be ingrafted, and the treatment was a complete success--the young Montagu enjoyed lifelong immunity from smallpox. Lady Montagu's discovery would, however, remain a quiet one, it would be almost 150 years before inoculation (in the more modern form of vaccination) would become widely accepted while the medical community struggled to understand the way our bodies defend themselves against disease. William Clark's At War Within takes us on a fascinating tour through the immune system, examining the history of its discovery, the ways in which it protects us, and how it may bring its full force to bear at the wrong time or in the wrong place. Scientists have only gradually come to realize thatthis elegant defense system not only has the potential to help, as in the case of smallpox, but also the potential to do profound harm in health problems ranging from allergies to AIDS, and from organ transplants to cancer. Dr. Clark discusses the myriad of medical problems involving the immunesystem, and he systematically explains each one. For example, in both tuberculosis and AIDS, the underlying pathogens take up residence within the immune system itself, something Clark compares to having a prowler take up residence in your house, crawling around throughthe walls and ceilings whilewaiting to do you in. He discusses organ transplants, showing how the immune system can work far too well, and touching on the heated ethical debate over the use of both primate and human organs. He explores the mind's powerful ability to infl