The article reviews the importance of insolation as a factor of prevention and containment of infec-tious diseases and epidemics. The authors consid-er insolation not as a mean of curing the Сoronavi-rus Disease (WHO fairly calls such possibility “a myth”) but as a means to lower the risks of dissemination of the infection, to reduce viability of the vi-rus in the environment, to support human protective immune mechanisms affecting susceptibility of the population as a whole, severity and recovery time, i.e. both sanitary and hygienic and prevention factors of the COVID-19 epidemic containment. Apart from the germicidal and virucidal sanitising effects of solar rays, the article reviews anti-epidemic capabilities of insolation as a microclimate factor and a psychological and physiological regulator of human protective capabilities as well as the insolation standards as a mechanism of development density regu-lation. It is impossible to efficiently combat massive dissemination of highly contagious infections with-out concerted utilisation of all available means and measures: both medical and preventive and organi-sational. The unprecedented mobilisation of health-care systems and large-scale restrictive quarantine measures are under special attention of the society. This article reviews the importance of insolation as a universal natural anti-epidemic factor which is un-deservedly placed in the end of the list of effective infection combating measures.