The basic principles of the methods used in the study of the total morbidity rate of the rural population of Sliven district are described in the present paper and the same time morbidity rate of the diseases of the circulation organs are analyzed. The level of the morbidity rate of the diseases of circulation organs, according to the visits of the rural population in the district was established to be 30236% 000. With the complex medical examination of the physicians' brigade of the representative sample from the population observed a latent morbidity rate was established to the extent of 12658% 000, i.e. the actual morbidity rate of rural population of the diseases of the circulation organs in the district was 42 895% 000. The morbidity rate according to age-sex groups and nozological forms was analyzed in the present paper.
