In 1948 Chumakov became a corresponding member, and in 1960 a full member of Academy of Medical Sciences of the USSR. Beginning in the 1940s Chumakov organized multiple medical expeditions to Siberia and other regions of the Soviet Union to investigate outbreaks caused by new viruses. Among viruses discovered and studied by Chumakov are Omsk hemorrhagic fever and Kemerovo fever viruses,[2] hantavirus causing renal syndrome, Crimean-Congo Hemorrhagic Fever virus, and many others.