title: Vaginal ring may help with HIV prevention.
mesh_terms: D000282:Administration, Intravaginal; D000890:Anti-Infective Agents / Q000008:administration & dosage; D003274:Contraceptive Devices, Female; D005260:Female; D015658:HIV Infections / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008795:Metronidazole / Q000008:administration & dosage; D009660:Northern Ireland; D010570:Pessaries; D012307:Risk Factors; D016585:Vaginosis, Bacterial / Q000150:complications / Q000517:prevention & control*
chemical_list: D000890:Anti-Infective Agents; D008795:Metronidazole