EN
In this article the data about new localities of Babesia microti in Poland are presented. Attention is paid to the mammalian hosts for this pathogen. Seven species of rodents (Clethrionomys glareolus, Microtus agrestis, M. oeconomus, M. arvalis, Apodemus flavicollis, A. agrarias, Mus musculus) and 4 species of shrews (Sorex araneus, S. minutas, Neomys fodiens, N. anomalas) were investigated in 3 localities - Białowieża, Mazury Lakeland and Katowice. The results show the competence of M. agrestis and M. oeconomus as zoonotic reservoir of B. microti in south and north Poland.