Evaluating the Safety and Immunogenicity of the IHV01 Protein Vaccine Primed and Co-Administered With HIV DNA CON-S Env Vaccine in Healthy, HIV-1-Uninfected Adults

This study will evaluate the safety and immunogenicity of the IHV01 protein vaccine primed
and co-administered with HIV DNA CON-S env vaccine in healthy, HIV-1-uninfected adults.

Participants will be randomly assigned to two groups. Participants in Group 1 will receive 4
mg of DNA CON-S env at Months 0 and 1. They will receive 4 mg of DNA CON-S env and 150 mcg of
IHV01 at Months 3 and 6. Participants in Group 2 will receive placebo at Months 0, 1, 3, and
6.

Study visits will occur at Day 0 (study entry), Week 2, and Months 1, 1.5, 3, 3.5, 6, 6 + 1
week, 6.5, and 12. Visits may include physical examinations, medical history, injection of
study product, blood and urine collection, pregnancy testing, HIV testing, risk reduction
counseling, and questionnaires.

Inclusion Criteria:

General and Demographic Criteria

- Age of 18 to 50 years

- Access to a participating HIV Vaccine Trials Network (HVTN) clinical research site
(CRS) and willingness to be followed for the planned duration of the study

- Ability and willingness to provide informed consent

- Assessment of understanding: volunteer demonstrates understanding of this study;
completes a questionnaire prior to first vaccination with verbal demonstration of
understanding of all questionnaire items answered incorrectly

- Agrees not to enroll in another study of an investigational research agent before the
last required clinic visit

- Good general health as shown by medical history, physical exam, and screening
laboratory tests

HIV-Related Criteria:

- Willingness to receive HIV test results

- Willingness to discuss HIV infection risks and amenable to HIV risk reduction
counseling.

- Assessed by the clinic staff as being at "low risk" for HIV infection and committed to
maintaining behavior consistent with low risk of HIV exposure through the last
required protocol clinic visit. Low risk guidelines are found on the protocol web page
under Study Materials on the HVTN Members' site
(https://members.hvtn.org/protocols/hvtn125).

Laboratory Inclusion Values

Hemogram/Complete blood count (CBC)

- Hemoglobin greater than or equal to 11.0 g/dL for volunteers who were born female,
greater than or equal to 13.0 g/dL for volunteers who were born male

- White blood cell count equal to 3,300 to 12,000 cells/mm^3

- Total lymphocyte count greater than or equal to 800 cells/mm^3

- Remaining differential either within institutional normal range or with site physician
approval

- Platelets equal to 125,000 to 550,000/mm^3

Chemistry

- Chemistry panel: alanine aminotransferase (ALT) less than 1.25 times the institutional
upper limit of normal and creatinine less than or equal to institutional upper limits
of normal.

Virology

- Negative HIV-1 and -2 blood test: US volunteers must have a negative US Food and Drug
Administration (FDA)-approved enzyme immunoassay (EIA).

- Negative Hepatitis B surface antigen (HBsAg)

- Negative anti-Hepatitis C virus antibodies (anti-HCV), or negative HCV polymerase
chain reaction (PCR) if the anti-HCV is positive

Urine

Normal urine:

- Negative urine glucose, and

- Negative or trace urine protein, and

- Negative or trace urine hemoglobin (if trace hemoglobin is present on dipstick, a
microscopic urinalysis with red blood cells levels within institutional normal range).

Reproductive Status

- Volunteers who were born female: negative serum or urine beta human chorionic
gonadotropin pregnancy test performed prior to vaccination on the day of initial
vaccination. Persons who are NOT of reproductive potential due to having undergone
total hysterectomy or bilateral oophorectomy (verified by medical records), are not
required to undergo pregnancy testing.

- Reproductive status: A volunteer who was born female must:

- Agree to consistently use effective contraception (see the protocol for more
information) for sexual activity that could lead to pregnancy from at least 21
days prior to enrollment until three months after the last study injection.
Effective contraception is defined as using the following methods:

- Condoms (male or female) with or without a spermicide,

- Diaphragm or cervical cap with spermicide,

- Intrauterine device (IUD),

- Hormonal contraception, or

- Any other contraceptive method approved by the HVTN 125 Protocol Safety Review
Team (PSRT)

- Successful vasectomy in the male partner (considered successful if a volunteer
reports that a male partner has [1] documentation of azoospermia by microscopy,
or [2] a vasectomy more than 2 years ago with no resultant pregnancy despite
sexual activity postvasectomy);

- Or not be of reproductive potential, such as having reached menopause (no menses
for 1 year) or having undergone hysterectomy, bilateral oophorectomy, or tubal
ligation;

- Or be sexually abstinent.

- Volunteers who were born female must also agree not to seek pregnancy through
alternative methods, such as artificial insemination or in vitro fertilization until
after the last required protocol clinic visit

Exclusion Criteria:

General

- Blood products received within 120 days before first vaccination

- Investigational research agents received within 30 days before first vaccination

- Body mass index (BMI) greater than or equal to 40; or BMI greater than or equal to 35
with 2 or more of the following: age greater than 45, systolic blood pressure greater
than 140 mm Hg, diastolic blood pressure greater than 90 mm Hg, current smoker, known
hyperlipidemia

- Intent to participate in another study of an investigational research agent or any
other study that requires non-HVTN HIV antibody testing during the planned duration of
the HVTN 125 study

- Pregnant or breastfeeding

- Active duty and reserve US military personnel

Vaccines and other Injections

- HIV vaccine(s) received in a prior HIV vaccine trial. For volunteers who have received
control/placebo in an HIV vaccine trial, the HVTN 125 PSRT will determine eligibility
on a case-by-case basis.

- Previous receipt of monoclonal antibodies (mAbs), whether licensed or investigational;
the HVTN 125 PSRT will determine eligibility on a case-by-case basis.

- Non-HIV experimental vaccine(s) received within the last 5 years in a prior vaccine
trial. Exceptions may be made by the HVTN 125 PSRT for vaccines that have subsequently
undergone licensure by the FDA. For volunteers who have received control/placebo in an
experimental vaccine trial, the HVTN 125 PSRT will determine eligibility on a
case-by-case basis. For volunteers who have received an experimental vaccine(s)
greater than 5 years ago, eligibility for enrollment will be determined by the HVTN
125 PSRT on a case-by-case basis.

- Live attenuated vaccines received within 30 days before first vaccination or scheduled
within 14 days after injection (eg, measles, mumps, and rubella [MMR]; oral polio
vaccine [OPV]; varicella; yellow fever)

- Any vaccines that are not live attenuated vaccines and were received within 14 days
prior to first vaccination (eg, tetanus, pneumococcal, Hepatitis A or B)

- Allergy treatment with antigen injections within 30 days before first vaccination or
that are scheduled within 14 days after first vaccination

Immune System

- Immunosuppressive medications received within 168 days before first vaccination (Not
exclusionary: [1] corticosteroid nasal spray; [2] inhaled corticosteroids; [3] topical
corticosteroids for mild, uncomplicated dermatitis; or [4] a single course of
oral/parenteral prednisone or equivalent at doses less than or equal to 60 mg/day and
length of therapy less than 11 days with completion at least 30 days prior to
enrollment)

- Serious adverse reactions to vaccines or to vaccine components such as mannitol and
aluminum hydroxide, including history of anaphylaxis and related symptoms such as
hives, respiratory difficulty, angioedema, and/or abdominal pain. (Not excluded from
participation: a volunteer who had a nonanaphylactic adverse reaction to pertussis
vaccine as a child.)

- Immunoglobulin received within 60 days before first vaccination (for mAb see related
criterion above)

- Autoimmune disease (Not exclusionary: mild, well-controlled psoriasis)

- Immunodeficiency

Clinically significant medical conditions

- Untreated or incompletely treated syphilis infection

- Clinically significant medical condition, physical examination findings, clinically
significant abnormal laboratory results, or past medical history with clinically
significant implications for current health. A clinically significant condition or
process includes but is not limited to:

- A process that would affect the immune response,

- A process that would require medication that affects the immune response,

- Any contraindication to repeated injections or blood draws,

- A condition that requires active medical intervention or monitoring to avert
grave danger to the volunteer's health or well-being during the study period,

- A condition or process for which signs or symptoms could be confused with
reactions to vaccine, or

- Any condition specifically listed among the exclusion criteria below.

- Any medical, psychiatric, occupational, or other condition that, in the judgment of
the investigator, would interfere with, or serve as a contraindication to, protocol
adherence, assessment of safety or reactogenicity, or a volunteer's ability to give
informed consent

- Psychiatric condition that precludes compliance with the protocol. Specifically
excluded are persons with psychoses within the past 3 years, ongoing risk for suicide,
or history of suicide attempt or gesture within the past 3 years.

- Current anti-tuberculosis (TB) prophylaxis or therapy

- Asthma other than mild, well-controlled asthma. (Symptoms of asthma severity as
defined in the most recent National Asthma Education and Prevention Program (NAEPP)
Expert Panel report). Exclude a volunteer who:

- Uses a short-acting rescue inhaler (typically a beta 2 agonist) daily, or

- Uses moderate/high dose inhaled corticosteroids, or

- In the past year has either of the following:

- Greater than 1 exacerbation of symptoms treated with oral/parenteral
corticosteroids;

- Needed emergency care, urgent care, hospitalization, or intubation for asthma

- Diabetes mellitus type 1 or type 2, including cases controlled with diet alone. (Not
excluded: history of isolated gestational diabetes.)

- Thyroidectomy, or thyroid disease requiring medication during the last 12 months

- Hypertension:

- If a person has been found to have elevated blood pressure or hypertension during
screening or previously, exclude for blood pressure that is not well controlled.
Well-controlled blood pressure is defined as consistently less than or equal to
140 mm Hg systolic and less than or equal to 90 mm Hg diastolic, with or without
medication, with only isolated, brief instances of higher readings, which must be
less than or equal to 150 mm Hg systolic and less than or equal to 100 mm Hg
diastolic. For these volunteers, blood pressure must be less than or equal to 140
mm Hg systolic and less than or equal to 90 mm Hg diastolic at enrollment.

- If a person has NOT been found to have elevated blood pressure or hypertension
during screening or previously, exclude for systolic blood pressure greater than
or equal to 150 mm Hg at enrollment or diastolic blood pressure greater than or
equal to 100 mm Hg at enrollment.

- Bleeding disorder diagnosed by a doctor (eg, factor deficiency, coagulopathy, or
platelet disorder requiring special precautions)

- Malignancy (Not excluded from participation: Volunteer who has had malignancy excised
surgically and who, in the investigator's estimation, has a reasonable assurance of
sustained cure, or who is unlikely to experience recurrence of malignancy during the
period of the study)

- Seizure disorder: History of seizure(s) within past three years. Also exclude if
volunteer has used medications in order to prevent or treat seizure(s) at any time
within the past 3 years.

- Asplenia: any condition resulting in the absence of a functional spleen

- History of hereditary angioedema, acquired angioedema, or idiopathic angioedema.