Despite cold War tensions the director of Moscow's Polio Research Institute traveled to the U.S. to study the Salk polio vaccine and visit Sabin's laboratory.
In January 1956, despite Cold War tensions, Mikhail Chumakov, the director of Moscow's Polio Research Institute, along with his wife virologist Marina Voroshilova, and his colleague Anatoli Smorodentsev, traveled to the U.S. in order to study the Salk vaccine. They also visited the laboratory of Albert Sabin. 
