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Inclusion Criteria:

* Age of 18 to 40 years
* Access to a participating HVTN 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
* Good general health as shown by medical history, physical exam, and screening laboratory tests
* 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 (per Low Risk Guidelines for South African sites) and committed to maintaining behavior consistent with low risk of HIV exposure through the last required protocol clinic visit
* Hemoglobin ≥ 11.0 g/dL for volunteers who were born female, ≥ 13.0 g/dL for volunteers who were born male
* WBC = 3,300 to 12,000 cells/mm3
* Total lymphocyte count ≥ 800 cells/mm3
* Remaining differential either within institutional normal range or with site physician approval
* Platelets = 125,000 to 550,000/mm3
* Chemistry panel: ALT, AST, and ALP \< 1.25 times the institutional upper limit of normal; creatinine ≤ institutional upper limit of normal.
* Negative HIV-1 and -2 blood test: Sites may use locally available assays that have been approved by HVTN Laboratory Operations.
* 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
* 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).
* Volunteers who were born female: negative urine beta human chorionic gonadotropin (β-HCG) pregnancy test performed prior to vaccination on the day of initial vaccination or negative serum beta human chorionic gonadotropin (β-HCG) pregnancy test within 24 hours prior to initial vaccination. Persons who are NOT of reproductive potential due to having undergone total hysterectomy with 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 for sexual activity that could lead to pregnancy from at least 21 days prior to enrollment through the last required protocol clinic visit. Effective contraception for participants in South Africa is defined as using 2 methods, including the following:
  * Condoms (male or female), or
  * Diaphragm or cervical cap,

PLUS 1 of the following methods:

* Intrauterine device (IUD),
* Hormonal contraception (in accordance with Republic of South Africa: National Contraception Clinical Guidelines),
* 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
* Any other contraceptive method approved by the HVTN 100 PSRT
* 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:

* Blood products received within 120 days before first vaccination
* Investigational research agents received within 30 days before first vaccination
* Body mass index (BMI) ≥ 40; or BMI ≥ 35 with 2 or more of the following: systolic blood pressure \> 140 mm Hg, diastolic blood pressure \> 90 mm Hg, current smoker, known hyperlipidemia
* Intent to participate in another study of an investigational research agent or any study that includes HIV testing during the planned duration of the HVTN 100 study
* Pregnant, breastfeeding, or lactating
* HIV vaccine(s) received in a prior HIV vaccine trial. For volunteers who have received control/placebo in an HIV vaccine trial, the HVTN 100 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 for vaccines that have subsequently undergone licensure by the South Africa Medicines Control Council (MCC). For volunteers who have received control/placebo in an experimental vaccine trial, the HVTN 100 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 100 PSRT on a case-by-case basis.
* Live attenuated vaccines other than influenza vaccine 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)
* Influenza vaccine or 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
* Immunosuppressive medications received within 168 days before first vaccination. (Not excluded from participation: \[1\] corticosteroid nasal spray; \[2\] inhaled corticosteroids; \[3\] topical corticosteroids for mild, uncomplicated dermatitis; or \[4\] a single course of oral/parenteral corticosteroids at doses \< 2 mg/kg/day and length of therapy \< 11 days with completion at least 30 days prior to enrollment.)
* Serious adverse reactions to vaccines or to vaccine components such as eggs, egg products, or neomycin, 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
* Autoimmune disease
* Immunodeficiency
* 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 or moderate, 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 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 ≤ 140 mm Hg systolic and ≤ 90 mm Hg diastolic, with or without medication, with only isolated, brief instances of higher readings, which must be ≤ 150 mm Hg systolic and ≤ 100 mm Hg diastolic. For these volunteers, blood pressure must be ≤ 140 mm Hg systolic and ≤ 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 ≥ 150 mm Hg at enrollment or diastolic blood pressure ≥ 100 mm Hg at enrollment.
* Bleeding disorder diagnosed by a doctor (eg, factor deficiency, coagulopathy, or platelet disorder requiring special precautions)
* Malignancy (Not excluded: 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.

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