The first effective vaccine against polio was prepared by : A)J.H. Gibbon B)Jonas E. Salk C)Robert Edwards D)James Simpson
Option B) Jonas Edward Salk was an American medical researcher and virologist, best known for his discovery and development of the first polio vaccine. On April 12, 1955, Dr. Thomas Francis, Jr., of the University of Michigan, the monitor of the test results, "declared the vaccine to be safe and effective.”
