Leukorrhea is the specimen retained for bacterial culture for vaginitis, which includes trichomoniasis, bacterial vaginitis, and fungal vaginitis. Normal flora exists in the vagina, dominated by Lactobacillus, which maintains an acidic environment in the vagina. Pathogenic bacterial contamination can cause vaginitis, and the first step is to perform vaginal microbiological tests, such as routine leukorrhea testing, to clarify whether the environment in the vagina is alkaline, and to clarify the pathogenic bacteria by using clue cells and smears for trichomonas. Bacterial culture is not difficult, for example, bacterial vaginitis the main germs are vaginal gardnerella, but more often take routine testing of vaginal secretions to clarify the pathogenic bacteria, empirical medication.