Jonas Salk made a big contribution to science in the 1950s: (D) he created a vaccine against polio.
Jonas Salk was an American medical researcher. He developed a successful vaccine against polio, which was considered one of the most dangerous infectious diseases during the first half of the 20th century. Polio is caused by the poliovirus and some of the symptoms of this disease are abdominal pain and muscle weakness. After more than 3,000 people had died from the disease in 1952, Jonas Salk announced on a national radio show that he had created a vaccine against polio in 1953.
