At War Within: The Double-Edged Sword of ImmunityIn 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 or inoculation, 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