EN
Cats bury their feces in places of easy access for children (backyards, playgrounds). The possibility of infestation of humans by invasive forms of parasites has initiated studies on the extensiveness of parasitic invasion of the alimentary tract of cats in the Olsztyn region (4 suburbs and 4 downtown quarters). Two hundred and forty samples of fresh feces (20 samples from each quarter) have been examined by the flotation and decantation method. Extensiveness of parasitic invasion ranged from 10 to 50%. The most prevalent were: Toxocara leonina (7%), T. canis (5%), Taenia spp., as well as Opistorchis felineus (3.18%) and Ancylostomatidae (2.2%). In one sample proglottids of Echinococcus spp. were determined. About 5% of cats from the examined region were infested by Toxocara canis - a parasite causing heavy infestation in humans.