Mikhail Petrovich Chumakov (Russian: Миха′ил Петр′ович Чумак′ов) (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.[1]