Treatment of Gardnerella Vaginalis Vaginal Colonization With Amoxicillin

This is a randomized, double-blind, placebo-controlled Phase 2 study designed to determine if
amoxicillin will eradicate vaginal colonization/infection with Gardnerella vaginalis (GV)
when administered to women who are colonized/infected with GV but have no clinical evidence
of Bacterial Vaginosis (BV). The study will be conducted at 2 clinics in the United States:
University of Alabama at Birmingham and Wake Forest University Health Sciences. Entire study
duration is approximately 24 months and subject participation duration is approximately 22
days. Approximately 245 healthy adult females, 18 to 45 years of age will be screened to
enroll approximately 98 participants to achieve 82 evaluable participants at the test of cure
(ToC) visit. Women who consent to screening participation will undergo pelvic examination on
entry and vaginal specimens collected for pH, whiff test and wet prep microscopy (Amsel
criteria with the exception of evaluation of vaginal discharge), Nugent score, nucleic acid
amplification test (NAAT) for trichomonas, quantitative NAAT for GV, and microbiome analysis.
At Visit 1 (Enrollment - Day 1), women who tested positive for GV by NAAT, negative for BV by
Nugent, and negative for trichomonas by NAAT will be enrolled and randomized to one of two
groups, either amoxicillin (2 x 250 mg capsules by mouth twice daily for 7 days) or placebo.
Women who are enrolled will be asked to return for one further visit, Visit 2 (Day 15 - 21),
where a ToC will be completed (a pelvic exam completed with the same specimens taken as those
at baseline with the exception of the trichomonas NAAT). For those not enrolled,
participation will end at their post screening follow up phone call. Women will be asked to
use condoms during their participation. The primary objective is to determine if treatment
with amoxicillin eradicates GV in women who are colonized/infected with GV but have no
clinical evidence of BV. The secondary objective is to evaluate the safety and tolerability
of amoxicillin compared to placebo.

Inclusion Criteria:

1. Women ages 18-45, inclusive.

2. No evidence of vaginitis (yeast, trichomonas, and BV/abnormal vaginal flora) or other
vaginal conditions which in the opinion of the investigator could be confounders*.

*These causes will initially be detected by wet mount microscopy with trichomonas
during the screening procedures and later confirmed by NAAT and BV/abnormal vaginal
flora confirmed by Nugent scoring (Nugent score of 4-10) (see Section 8)

3. Presence of GV detected by NAAT*.

*Results of NAAT testing will be available prior to return for Enrollment visit.

4. Willing to use condoms during vaginal intercourse while participating in the study.

5. Not currently menstruating at screening visit.

6. Willing and able to provide written informed consent.

7. Negative urine pregnancy test on all participants of childbearing potential at study
screening.

8. Participant must be of non-childbearing potential* or must be using highly effective
birth control** to avoid becoming pregnant.

*Non-childbearing potential is defined as being post-menopausal for at least 1 year,
status after bilateral tubal ligation, or status after bilateral oophorectomy or
status after hysterectomy.

**In addition to the required use of condoms by the male partner during study
participation, participants must agree to avoid becoming pregnant by using one of the
following acceptable method of birth control for 30 days prior to screening and for
the duration of the study:

- Intrauterine contraceptive device; OR

- Oral contraceptives; OR

- Hormonal injections; OR

- Hormonal implants; OR

- Contraceptive patches; OR

- Monogamous relationship with vasectomized partner; OR

- Exclusively same-sex relationships; OR

- Abstinence

9. Participant is not planning on taking antibiotics or using any intravaginal
microbicides from the Screening visit through the Visit 2 Follow-up (TOC).

10. Participant is willing and able to cooperate to the extent and degree required by this
protocol at the discretion of the investigator.

Exclusion Criteria:

1. Pregnant or nursing.

2. Allergic to penicillin, amoxicillin, cephalosporins, or other ß-lactam antibiotic.

3. Use of antibiotics in the past 14 days prior to screening visit.

4. HIV infected.

5. Women taking immunosuppressive agents.

7. History of renal impairment. 8. Use of any investigational drug within the past 30 days
prior to screening. 9. Any other condition that, in the opinion of the investigator, would
interfere with participation in the study.