This viral illness often leave its survivors with muscle weakness or varying degrees of paralysis. Although vaccines have eradicated polio in the United States and other countries, the disease remains a threat in the developing world. This volume contains the latest vaccination information, world outbreak and immunization statistics, and a progress report on international efforts to eradicate polio. Second edition. Includes full-color photographs and illustrations, notes, glossary, and index. 9 chapters, 116 pages.