Just three months later, Jonas E. Salk announced that he had successfully tested his dead polio virus vaccine on 440,000 elementary school students, and the United States Public Health Service ...

There is still no cure for the disease. But at the peak of its devastation in the United States, Jonas Salk introduced a way to prevent it. This infectious viral disease attacks the nerve cells ...

There is still no cure for the disease. But at the peak of its devastation in the United States, Jonas Salk introduced a way to prevent it. This infectious viral disease attacks the nerve cells ...