Trichomonas vaginalis was first discovered was a Frenchman, was in 1836 from the vaginal secretions of women suffering from vaginitis found, and in 1838 officially named Trichomonas vaginalis.

     Trichomonas parasites in the human body in three ways: oral trichomonas, Trichomonas hominis (parasites in the gut), and Trichomonas vaginalis. Trichomonas vaginalis urinary mainly affects the body’s reproductive system, it can be parasitic on the female genital skin fold, the paraurethral gland, under the urethra, Bartholin’s glands, vagina and cervix tube; in men, more than Trichomonas vaginalis parasitic in the urinary tract and prostate. The other two kinds of human body is not infected with Trichomonas vagina. In general, there are some people healthy women within the vagina with Trichomonas vaginalis, but it does not cause inflammatory reaction, may be vaginal trichomoniasis are not suited to the growth of the environment, but also probably because of the insects infected with strain virulence is not strong by induced. But when the vaginal environment changes conducive to the growth of trichomonas, when, it may cause trichomoniasis vaginitis. Trichomonas vaginitis is a very common form of women of childbearing age vaginal inflammation, its prevalence rate second only to fungal vaginitis.

     Trichomonas can be transmitted through sexual life can also be spread through indirect contact, swimming pool, bath basin in particular, can be a pond places spread of trichomoniasis. His mother and was transmitted to newborns suffering from trichomoniasis is also possible.