While this book is intended for parents who are overwhelmed by the conflicting messages on this important topic, it is also an excellent reference for medical researchers and professionals seeking to deepen their scientific understanding of vaccine safety. Whether you are new to the vaccine debate or a "veteran" seeking a deeper understanding of the science, this book is a must-read. It is also an excellent introduction to vaccination and can be shared with friends and relatives who might benefit from delving deeper into the subject.