9781422285749

CHAPTER ONE

T H E D O U B T I N G D I S E A S E

Words to Understand antibodies: substances produced by the human body to attack viruses and infections. compulsion: the strong need to complete an action. intrusive: unwelcome and annoying. obsession: an idea that a person cannot force out of his or her mind, even if he or she wants to. plateau: a stable, level place. ritual: an activity that is repeated again and again in the same way.

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