Paul A. Offit and Charlotte A. Moser answer questions about the science and safety of modern vaccines. In straightforward prose, they explain how vaccines work, how they are made, and how they are tested. Most important, they separate the real risks of vaccines from feared but unfounded risks. Offit and Moser address parental fears that children may receive too many vaccines too early, that the HPV vaccine may cause chronic fatigue or other dangerous side effects, that additives and preservatives in vaccines cause autism, and that vaccines might do more harm than good. There couldn't be a better moment or more pressing need for this book, which offers honesty--instead of hype--in the quest to protect children's health.