Mobiluncus: A genus of gram-negative, anaerobic, rod-shaped bacteria. Its organisms are found in the human vagina, particularly in association with Gardnerella vaginalis in cases of bacterial vaginosis.Bacteria, AnaerobicVaginitis: Inflammation of the vagina characterized by pain and a purulent discharge.Gardnerella vaginalis: A species in the genus GARDNERELLA previously classified as Haemophilus vaginalis. This bacterium, also isolated from the female genital tract of healthy women, is implicated in the cause of bacterial vaginosis (VAGINOSIS, BACTERIAL).Vaginosis, Bacterial: Polymicrobial, nonspecific vaginitis associated with positive cultures of Gardnerella vaginalis and other anaerobic organisms and a decrease in lactobacilli. It remains unclear whether the initial pathogenic event is caused by the growth of anaerobes or a primary decrease in lactobacilli.Vaginal Diseases: Pathological processes of the VAGINA.Gram-Negative Anaerobic Bacteria: A large group of anaerobic bacteria which show up as pink (negative) when treated by the Gram-staining method.Vagina: The genital canal in the female, extending from the UTERUS to the VULVA. (Stedman, 25th ed)Sexually Transmitted Diseases, Bacterial: Bacterial diseases transmitted or propagated by sexual conduct.Superinfection: A frequent complication of drug therapy for microbial infection. It may result from opportunistic colonization following immunosuppression by the primary pathogen and can be influenced by the time interval between infections, microbial physiology, or host resistance. Experimental challenge and in vitro models are sometimes used in virulence and infectivity studies.Ureaplasma urealyticum: A species of gram-negative bacteria found in the human genitourinary tract (UROGENITAL SYSTEM), oropharynx, and anal canal. Serovars 1, 3, 6, and 14 have been reclassed into a separate species UREAPLASMA parvum.Bacterial Infections: Infections by bacteria, general or unspecified.