The 10-volume "Health Facts" series is intended to supplement health education curricula and to provide a handy reference for individuals who would like additional background information on particular health topics. The emphasis is placed on topics and examples relevant to youth of middle and high school age. The five sections in this book on disease prevention provide teachers with basic facts about: the differences between health and disease; the concept of prevention; infectious and noninfectious diseases; the relationship between behavior and chronic disease; and mental illness. An easy to read reference format offers clear, concise data intended to familiarize educators with the most important facts about the issues and concerns. A glossary, a list of resources, and 22 references complete the volume. (LL)