• Acceptability of intravaginal ring [ Time Frame: Throughout study ] [ Designated as safety issue: No ]
  
• Grade 2 or higher adverse event [ Time Frame: Throughout study ] [ Designated as safety issue: Yes ]
  

• Frequency of intravaginal ring removal and duration of time without intravaginal ring inserted in vagina [ Time Frame: At Week 12 ] [ Designated as safety issue: No ]
  
• Changes in vaginal flora as measured by Nugent score [ Time Frame: At Week 12 ] [ Designated as safety issue: No ]
  
• Changes in quantitive vaginal culture. More information on this criterion can be found in the protocol. [ Time Frame: At Week 12 ] [ Designated as safety issue: No ]
  
• Symptoms and signs suggestive of bacterial vaginosis or vulvovaginal candidiasis [ Time Frame: Throughout study ] [ Designated as safety issue: Yes ]
  
• Changes in vaginal pH and vaginal wet mount microscopy [ Time Frame: Throughout study ] [ Designated as safety issue: No ]
  

Women comprise a growing proportion of new HIV infections worldwide. Intravaginal rings (IVRs) used to deliver microbicides have the potential to significantly reduce the heterosexual transmission of HIV if found to be safe, acceptable, and effective against HIV infection. This study will investigate the safety and tolerability of a non-medicated silicone elastomer IVR in sexually active HIV uninfected women.

The expected duration of this study for each participant is 16 weeks. Study participants will be randomly assigned to one of two arms. Participants in Group A will insert an IVR into their vagina at study entry. The IVR will remain in place for 12 weeks until removed by a physician. Follow up will continue for an additional 4 weeks after IVR removal. Participants in Group B will not receive an IVR, but will follow the same study schedule as those in Group A.

After screening, this study will consist of four study visits occuring at Weeks 4, 8, 12, and 16. Medical, menstrual, and medication history, a behavioral assessment, targeted physical exam, and pelvic exam will occur at all visits. Condoms will be provided and counseling will be available at each visit. A colposcopy will occur at least once and blood and urine collection will occur at some visits. An adherence and acceptability assessment will occur at all visits for participants in Group A. Participants in Group A will also receive IVR counseling.

Inclusion Criteria:

• HIV uninfected
• General good health
• Normal menstrual cycle with at least 21 days between menses and no history of intermenstrual bleeding in the 3 months prior to study entry
• Sexually active. More information on this criterion is available in the protocol.
• Agree to use at least one effective methof of contraception. More information on this criterion can be found in the protocol.
• Normal Pap smear result within 12 months prior to study entry
• Agree to not participate in other drug or device research studies for the duration of study participation
• Agree to not use any intravaginal product for the duration of study participation

Exclusion Criteria:

• History of adverse reaction to silicone or latex
• Current male sex partner with known history of adverse reaction to silicone or latex
• Gynecological procedure within 90 days prior to study entry. More information on this criterion can be found in the protocol.
• Any abnormal physical or pelvic exam finding that, in the opinion of the investigator, would interfere with the study. More information on this criterion can be found in the protocol.
• Social or medical condition that, in the opinion of the investigator, would interfere with the study
• Current or anticipated participation in other drug or device research studies at enrollment and during the duration of study participation
• Severe pelvic relaxation. More information on this criterion can be found in the protocol.
• Pregnant