The author presents a review of scientific studies of the effect of some socio-economic factors of the country' development (population migrations, urbanization, land improvement, construction of artificial reservoirs, specialization and concentration of cattle-breeding etc.) on the feasibility of formation or reduction of helminthosis foci. Diverse effects of the afore-mentioned factors on the distribution of helminths are stressed. Importance of helminthosis control is underlined as well. Annual medical examination of the entire population is considered the main prophylaxis measure. The problems to be solved immediately by health administration are denominated.