Despite cold War tensions Mikhail Chumakov, a Soviet microbiologist and virologist, traveled to the U.S. to study the Salk polio vaccine.
Mikhail Petrovich Chumakov (Russian:   ) (November 14, 1909  June 11, 1993) was a Soviet microbiologist and virologist most famous for conducting pivotal large-scale clinical trials that led to licensing of the Oral Polio Vaccine (OPV) developed by Albert B. Sabin. 
