Should you vaccinate a child—and if so, why? The answers to these questions still aren’t obvious to many parents. American pediatrician and infectious disease specialist Paul Offit, one of the creators of the rotavirus vaccine, puts the question more sharply: should parents be given the right to make such a choice? As a result of mass refusals to vaccinate, epidemics of almost forgotten diseases have returned—whooping cough, measles, and meningitis. Trying to protect children from vaccine side effects, adults succumb to mass hysteria fueled by unconfirmed data and emotional reactions. In his book, Offit analyzes several anti-vaccination campaigns and brilliantly refutes the arguments of their activists, proving that refusing to vaccinate a child can be deadly. On the side of reason is science, medical practice, and a one-and-a-half-century history of universal vaccination.