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During the 20th century, smallpox was responsible for 500 million deaths, yet by the end of the century the disease was eradicated. How did this amazing accomplishment happen? How was the smallpox and other vaccines developed? This book explores role innovation has played in the development of these powerful disease fighters.|Index|Sources for further research|Glossary of key words|Informative sidebars|Table of contents|Author/Illustrator biography|The Innovation in Medicine series explores the role innovation has played in medicine and how peoples life and health have improved as a result. Life expectancy has increased by some 28 years in the last 100 years. Many attribute this increase to advances in medicine.