Trichomonads were cultured in medium containing serum of patients treated with SolcoTrichovac. Due to the antibodies in this serum the trichomonads showed signs of destruction even after 3 days. In control cultures to which ordinary serum had been added, trichomonads survived for 8–10 days. The killing effect of the SolcoTrichovac-induced antibodies was even stronger than that of metronidazol