Evaluating the Safety and Drug Levels of an Antibody Against HIV in Healthy, HIV-Uninfected Adults

Inclusion Criteria: General and Demographic Criteria * Weight at least 53 kg and up to 115 kg * 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: participant demonstrates understanding of this study; completes a questionnaire prior to first infusion, with verbal demonstration of understanding of all questionnaire items answered incorrectly * Agrees not to enroll in another study of an investigational research agent until completion of the last study 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, amenable to HIV risk reduction counseling, and committed to maintaining behavior consistent with low risk of HIV exposure through the last required protocol clinic visit * 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 Laboratory Inclusion Values Hemogram/Complete Blood Count (CBC) * Hemoglobin greater than or equal to 11.0 g/dL for participants who were born female, greater than or equal to 13.0 g/dL for participants who were born male * White blood cell count equal to 2,500 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), aspartate aminotransferase (AST), and alkaline phosphatase less than 1.25 times the institutional upper limit of normal; creatinine less than or equal to the institutional upper limit of normal Virology * Negative HIV-1 and -2 blood test: U.S. participants must have a negative Food and Drug Administration (FDA)-approved enzyme immunoassay (EIA). * Negative hepatitis B surface antigen (HBsAg) * Negative anti-hepatitis C virus (anti-HCV) antibodies, 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 cell levels within institutional normal range). Reproductive Status * Participants who were born female: negative serum or urine beta human chorionic gonadotropin (beta-HCG) pregnancy test performed prior to infusion on the day of initial infusion. Persons who are not of reproductive potential because of having undergone total hysterectomy with bilateral oophorectomy (verified by medical records) are not required to undergo pregnancy testing. * Reproductive status: A participant 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 through the last required protocol clinic visit. Effective contraception is defined as using any of the following methods: condoms (male or female) with or without a spermicide; diaphragm or cervical cap with spermicide; intrauterine device (IUD); hormonal contraception; any other contraceptive method approved by the HVTN 104 Protocol Safety Review Team (PSRT); successful vasectomy in the male partner (considered successful if a participant 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. * Participants 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 infusion, unless eligibility for earlier enrollment is determined by the HVTN 104 PSRT * Investigational research agents received within 30 days before first infusion * Intent to participate in another study of an investigational research agent during the planned duration of the HVTN 104 study * Pregnant or breastfeeding Vaccines and Other Injections * HIV vaccine(s) received in a prior HIV vaccine trial. For participants who have received control/placebo in an HIV vaccine trial, the HVTN 104 PSRT will determine eligibility on a case-by-case basis. * Non-HIV experimental vaccine(s) received within the last 6 months in a prior vaccine trial. Exceptions may be made for some vaccines and vaccine trials. For participants who have received an experimental vaccine(s) less than 6 months ago, eligibility for enrollment will be determined by the HVTN 104 PSRT on a case-by-case basis. * Live attenuated vaccines other than influenza vaccine received within 10 days before first infusion and with no evidence of residual inflammation; or scheduled within 10 days after first infusion (e.g., measles, mumps, and rubella \[MMR\]; oral polio vaccine \[OPV\]; varicella; yellow fever). * Previous receipt of humanized or human monoclonal antibodies (mAbs) whether licensed or investigational Immune System * Immunosuppressive medications received within 30 days before first infusion. (Not excluded: \[1\] corticosteroid nasal spray; \[2\] inhaled corticosteroids; \[3\] topical corticosteroids for mild, uncomplicated dermatitis; or \[4\] a single course of oral/parenteral corticosteroids at doses less than 2 mg/kg/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, including history of anaphylaxis and related symptoms such as hives, respiratory difficulty, angioedema, and/or abdominal pain. (Not excluded: a participant who had a nonanaphylactic adverse reaction to pertussis vaccine as a child) * Immunoglobulin received within 90 days before first infusion, unless eligibility for earlier enrollment is determined by the HVTN 104 PSRT. * Autoimmune disease (Not excluded: participant with mild, stable, and uncomplicated autoimmune disease that does not require immunosuppressive medication and that, in the judgment of the site investigator, is likely not subject to exacerbation and likely not to complicate reactogenicity and adverse event \[AE\] assessments) * 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 infusions or blood draws, * A condition that requires active medical intervention or monitoring to avert grave danger to the participant'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 participant'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 participant 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 one 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) * 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 participants, 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 (e.g., factor deficiency, coagulopathy, or platelet disorder requiring special precautions) * Malignancy (Not excluded: participant 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 3 years. Also exclude if participant 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.