In 1955, after years of research and testing, the polio vaccine created by Jonas Salk was declared safe and effective. The devastating virus is nearly eradicated in the United States today. In 1946, however, two years before Jonas Salk first began his research, the city of San Antonio, Texas tried to prevent the spread of … Continue reading This Week in Universal News: Spraying DDT to Prevent Polio, 1946
