In 1994/96 there were examined 588 children attending four Warsaw's kindergartens. Investigations were made by means of a standard coprological methods and by ELISA method for the presence of coproantigens of Giardia. The extensiveness of the infection was about 12.5%. It seems that now only oxyuriosis is the most important epidemiological problem among these children. The complexity of diagnosis and treatment of infected children and some health's education may improve their health and prevent the spreading of invasion.