The population of the Russian Federation has been divided into 5 groups according to their immunity to measles; the epidemiological importance of this division for the prognosis of measles morbidity for the next decade has been substantiated. As revealed in this study, children under 6 years and born in 1966-1978 who have received only one immunization are least protected from measles and make up the main socio-epidemiological nucleus of the population which will determine the level of measles morbidity in the next decade. The conclusion has been made on the necessity of mass immunization (revaccination) of high school and college students and groups of servicemen not later than 1995 in order to eliminate measles by the year of 2000.