EN
Taking as the basis the data available in the literature the author discusses the frequency of the occurrence of lambliosis in Poland. As evident from the data about 5,5 per cent of the inhabitants of our country is infected with L. Intestinalis. Next the author described the pathological lesions which may appear in the course of lambtiosis and reaches the conclusion that. L. intestinalis can be regarded as a parasite of pathogenic properties. In the concluding notes of his report the author points to the necessity of mass control of the invasion with L. intestinalis.