Claim: Despite cold War tensions Louis Pasteur, a Soviet microbiologist and virologist, traveled to the U.S. to study the Salk polio vaccine.
Evidence: Louis Pasteur ForMemRS (/ˈluːi pæˈstɜːr/, French: [lwi pastœʁ; December 27, 1822 – September 28, 1895) was a French biologist, microbiologist, and chemist renowned for his discoveries of the principles of vaccination, microbial fermentation, and pasteurization.