Cold War tensions and the polio vaccine Sabin vaccine from the Soviet side. However other Soviet virologists argued that the Salk vaccine could be considered safe, since the Americans tested it on their own people. They considered that the Sabin vaccine must be potentially dangerous because the Americans did not wish to test it on their own society. The documented achievement of the Sabin-Chumakov collaboration eventually trumped the ideological differences of the Cold War. Their oral live-virus vaccine became federally licensed in 1962, and used for over three decades to help eliminate polio globally, replacing the Salk vaccine. Using these vaccines, the threat of polio remains only
A Little Frog Is looking for His Father no a father. Then The Little Frog says to The Little Grasshopper, "Do not cry. I'll be Your Dad..." A Little Frog Is looking for His Father A Little Frog Is looking for His Father () is The 1964 Soviet Russian Stop-motion Animation Film by Roman Kachanov. This Film produced by Soyuzmultfilm studio. The Little Frog looking for, but can not find a dad, who can protect him and play with him. He meets a various animals and asks them to become his dad. All these animals are larger than The Little Frog. An animals do not want to become