Includes bibliographical references and index.

Introduction -- Anxiety: when pathogens thrive and spread -- Curiosity: When people look for answers -- Determination: when people look for solutions -- Cleverness: how vaccines work -- Testing: how to know if a new vaccine works -- Risk: what it means to be vaccinated -- Reluctance: when people hesitate about vaccines -- Rules: when vaccines are required -- Access: how vaccines get distributed -- Responsibility: what we can do as individuals -- Glossary -- Resources -- Acknowledgments -- Index.

Part of the nonfiction Orca Timeline series, with photographs and illustrations throughout, this book examines the history, science, ethics and social issues related to infectious diseases and vaccines.

Ages 10 and up.