The results of preventive parasitological examinations for intestinal parasites in preschool and school children of the Turiec Region (Central Slovakia) in 1970–1999 are submitted. The study is divided into three cross-sections in the following decades (1970–1979; 1980–1989; 1990–1999). An acute decrease in geohelminths virtually to zero values has been found, as well as a significant decrease in intestinal protozoans. The occurrence of Enterobius vermicularis, despite its significant decrease in the recent decade, remains on a relatively high level. In the conclusion the authors discuss continuation of parasitological field examinations, and, on the basis of their 30-year experience, they submit their recommendations for the simplest and most effective way of such examinations.

        Key words: intestinal parasites – geohelminths – intestinal protozoans – Enterobius vermicularis.