Jonas Salk, American physician and medical researcher who developed the first safe and effective vaccine for polio. Salk’s vaccine was released for use in the United States in 1955. In the years that followed, polio incidence in the United States fell f
Explaining information- read about how Dr. Salk first tested his vaccine and explain it correctly Additional Learning To review more about this important man, use the lesson called Dr. Jonas Salk Lesson for Kids: Biography, Facts & Inventions. Thanks to this lesson, you can: ...