The paper presents methods of Fuzzy Set Theory which can be a helpful key to medical diagnosis on the basis of symptoms as well as to the differentiating the effectiveness of action of drugs (metronidazole, tinidazole and omidazole) in trichomoniasis. The relationship between patients and symptoms, symptoms and diagnoses or patients and diagnoses is considered as a fuzzy relation. A max-min composite fuzzy relation is a mathematical apparatus for finding the diagnoses such as: trichomoniasis, mycoses or bacterial infection. The solution of the other problem is based determining an eigen fuzzy set, associated with a given fuzzy relation, which can help to predict the theoretical maximal and minimal levels of recovery.
Data concerning 604 girls up 18 year old were analysed. On the basis clinical symptoms and results of culture of various biological materials on selected media - the monofocal trichomonadosis concerning the most often vulva and vagina, rarely urethra or other regions of urinary organ as well as the multifocal trichomonadosis, particularly complicated by mycosis were proved. It was found the convergence statistically significant (P≤0,5) of the invasion of T. vaginalis with some symptoms of inflammation of genital and urinary organs; the highest values of Pearson-Bravais coefficient was obtained in trichomonadosis of genital organs and vaginal discharges, pain of vulva and vagina, the picture of colpitis maculosa, but in the multifocal one also with itching and pain in urethra and dysuria. T. vaginalis without symptoms occurred very seldom in the girls.
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