EN
Using of fresh slides and culture T. vaginalis was found in 1094 persons (3.20%). It has been seen the morhpological differentiation of T. vaginalis connected with the age, physiological state of macroorganisms and the clinic picture of trichomoniasis. In vivo, the spheroidal as well as ameboidal forms of T. vaginalis were observed. The latter ones, characteristic in acute trichomoniasis, were often seen in pregnant women. On the other hand, nonmobile round-shaped forms of T. vaginalis occurred in vaginal contents of girls, women in child-bed and old (5 years after menopause) women. It seems, that morphologicaly variability of T. vaginalis depends on changes of specific environment of human vagina, which is very sensitive to hormon responses. It may be considered as adaptation of parasite to different biological conditions of vaginal environment.