[Several years of observation of the incidence of Trichomonas vaginalis infections among female workers in a single industrial plant].

During 5 years cycle a prophylactic gynaecological, cytological and parasitological examinations of 1918 women were performed. 12.8% of women were infected with T. vaginalis. Decreasing percentage of infections was observed: from 9.92% in 1984 to 2.2% in 1988. In the I. of Papanicolaou cervical smears T. vaginalis has been found in 1.60% of cases, in the II.--in 5.2%, in the III.--in 14.29%, and in the IV.--in 22.22% of cases. In women with normal cervix uteri T. vaginalis have been found in 5.01% of cases, and in women with hypertrophied cervix and partially epidermized ectopy with ovula nabothi in 15.28% of cases.