Ryazantsev S. V., Smirnov A. V. The preconditions of occurrence and social demographic consequences of pan- demics. Problemi socialnoi gigieni, zdravookhranenia i istorii meditsini. 2021;29(3):389—397 (In Russ.). DOI: http: ... Ryazantsev S. V., Smirnov A. V. The preconditions of occurrence and social demographic consequences of pan- demics. Problemi socialnoi gigieni, zdravookhranenia i istorii meditsini. 2021;29(3):389—397 (In Russ.). DOI: http:// dx.doi.org/10.32687/0869-866X-2021-29-3-389-397ISSN 0869-866XDOI 10.32687/0869-866X-2021-29-3-389-397РИНЦ: https://elibrary.ru/item.asp?id=46230488Posted on site: 16.07.21 AbstractThe article considers the historical features of development and theoretical approaches to defining the concept of “pan- demic” in social sciences. The approaches of demographic science to the study of the consequences of pandemics are out- lined. The prerequisites of occurrence of major pandemics at various historical stages of humankind development are highlighted. The particular attention is paid to pandemics in the XXI century. The demographic and social economic consequences of pandemics for the countries all over the world, including the countries on post-Soviet territory, are con- sidered. The characteristics of the COVID-19 pandemic are highlighted from the standpoint of social demographic conse- quences, including the impact on fertility and mortality. The key directions of pandemics control in some countries of the world are designated.