Professor 1935; corresponding member, USSR Academy of Medical Science, since 1946. Head, Chair of Medicine Parasitology, Central Postgraduate Medicine Institute, Moscow, since 1935. Head,Department of Pharmacology and Chemotherapy, Institute of Malaria, Medicine Parasitology and Helminthology, USSR Ministry of Health, since 1946.
Head, Protozoology Course, Moscow University, since 1949. Since 1957 Deputy Chairman, All-Russia Society of Epidemiologists, Microbiologists and Infectionists. Member, Editor Board, journal “Meditsinskaya parazitologiya i parazitarnye bolezni” (Medical Parasitology and Parasitic Diseases).
Member, Editor Council, journal “Antibiotiki” (Antibiotics). Со-Editor, “Epidemiology” and “Infectious Diseases” sections, “Bolshaya meditsinskaya entsiklopediya” (Large Medical Encyclopedia), 2nd edition. Led expeditions for the study of malaria, pappataci fever and other diseases in the Volga area, Central Asia, Crimea and several foreign countries.
Studied correlation of immunity and allergy. Introduced concept of immunological states. Formulated rule of reinoculation.
Introduced and substantiated the concept of functional parasitology. Founded semiotics of filtrable viruses. Devised new methods of staining blood and blood parasites.
Deduced laws governing hemogram changes in infectious diseases. Introduced leukocyte profile methods. Devised new method for the investigation, biological testing and efficient use of chemotherapeutic agents.
Formulated principle of physiological imitation. Introduced mathematical analysis methods into epidemiology. 1921-1935 associate, 1935-1946 Head,Department of Protozoology, Institute of Medicine Parasitology and Tropical Medicine, USSR Popular Commissariat of Health.