GENERAL KNOWLEDGE

Detailed explanation-1: -Not long afterwards, in the early 1950s, the first successful vaccine was created by US physician Jonas Salk . Salk tested his experimental killed-virus vaccine on himself and his family in 1953, and a year later on 1.6 million children in Canada, Finland and the USA.

Detailed explanation-2: -On March 26, 1953, American medical researcher Dr. Jonas Salk announces on a national radio show that he has successfully tested a vaccine against poliomyelitis, the virus that causes the crippling disease of polio.

Detailed explanation-3: -In 1955, Salk2 developed the inactivated poliovirus vaccine; thus began widespread immunisation. This was followed in 1960 by a live, attenuated oral vaccine developed by Sabin. The effect was impressive. From 28 000 reported cases of polio in 1955, in 1956, one year after immunisation, there were only 15 000 cases.

Detailed explanation-4: -Jonas Edward Salk. Dr. Jonas Edward Salk (1914-95) was an American medical researcher who discovered and developed the first successful polio vaccine. Born in New York City, he attended New York University School of Medicine, later choosing to do medical research instead of becoming a practicing physician.