The aim of the study was to determine the role of foreign citizens registered in Moscow region. in the maintenance of the epidemic process of measles. rubella and mumps based on the basis of their susceptibility to these infections and compare with the control group (residents of the Russia Central Federal District - donors of blood). Materials and methods. https://www.jmannino.com/special-deal-A-Magazine-Curated-By-Sacai-quick-pick/