Only Three Countries Left With Polio

Sixty years ago on April 12, Dr. Jonas Salk's polio vaccine was declared safe and effective. In just three years, the entire world could be polio free. Polio is a life-changing disease that mostly affects young children. It's been around for thousands of years. In fact, ancient Egyptian carvings show young men with withered legs, but it wasn't until the 1900s that the number of cases began to increase in the U.S. Oddly enough, it had to do with improved sanitation. Until...

© La Voix de l'Amérique - jeudi 9 avril 2015