This book's chapters discuss progress made through vaccines used in most of the world's immunization programs, describe the status of introduction of the newest vaccines currently available to immunization programs, review progress in the development of vaccines against some bacterial and viral diseases that are responsible for much of mortality due to diarrheal and acute respiratory illnesses, as well as the quest for vaccines against HIV/AIDS, malaria, and dengue. A section addresses technological aspects of vaccine development, such as new concepts, including DNA vaccine technology, and ne