Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Vaccination, also known as immunization, is the administration of biological preparations (vaccines) in order to improve immunity. Although a widespread controversy regarding safety and morality of immunization has left many doubting its positive effects, vaccination is considered to be safe. Moreover, medics remind that benefits of vaccination outnumber any possible adverse effects, reducing disability, death and inequity worldwide. Learn more about the practice of immunization and its history and benefits as well as the anti-vaccination movement in this book.