A Study to Evaluate the Safety and Efficacy of AV-1 Against Dengue Virus 3 (DENV-3) Infection

A Phase 2, Randomized, Double-Blind, Placebo-Controlled, Dose-Ranging Study to Compare the Safety and Efficacy of 3 Dose Levels of AV-1 in Healthy Adults Challenged With a Controlled Human Infection Strain of DENV-3

The goal of this clinical trial is to determine the prophylactic and therapeutic effect of AV-1 in healthy adults using a DENV-3 controlled human infection model (CHIM)

Study Overview

• Status: Completed
• Conditions: DENV-3 Controlled Human Infection Model
• Intervention / Treatment: Drug: AV-1 100 mg; Drug: Placebo; Drug: AV-1 300 mg; Drug: AV-1 900 mg

• Study Type: Interventional
• Enrollment (Actual): 85
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Maryland
    • Baltimore, Maryland, United States, 21205
      • Center for Immunization Research (CIR) JHBSPH
    • Baltimore, Maryland, United States, 21224
      • Center for Immunization Research Inpatient Unit
  • Vermont
    • Burlington, Vermont, United States, 05405
      • UVM Larner College of Medicine Department of MMG

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Males or nonpregnant, nonlactating females who were assigned males and females at birth, of any race, between 18 and 55 years of age
• Body mass index between 18.5 and 34.9 kg/m², inclusive, at Screening or Study Day -1 (Cohort A) or Study Day 0 (Cohort B)

• Normal 12-lead electrocardiogram (ECG). Normal ECG is defined as the absence of:

  1. QTcF >450 ms in men or >460 ms in women
  2. PR >220 ms ventricular or atrial premature contractions in couplets or higher in grouping
  3. Complete left or right bundle branch block
  4. 2nd or 3rd degree atrioventricular block
  5. Sustained ventricular or atrial arrhythmia
  6. ST elevation consistent with cardiac ischemia
  7. Potential subjects with non-clinical sinus arrhythmia could be included in the study
• Subjects in good health as determined by past medical history, medication use, physical examination, vital signs, and 12-lead ECG at Screening

• Females of childbearing potential must agree to use effective contraception through study duration

  1. Reliable methods of contraception include: long acting, reversible contraception (LARC), hormonal birth control* (implantable device, hormonal patch, hormonal vaginal ring, oral contraception, Depo-Provera injection, etc.), surgical sterilization (hysterectomy, tubal ligation, or tubal coil at least 90 days prior to Investigational Product [IP] dosing)
  2. Must agree to not donate ova or oocytes during the study
  3. Postmenopausal women must have had ≥12 months of spontaneous amenorrhea without an alternative medical cause for amenorrhea, with follicle-stimulating hormone (FSH) concentration ≥40 mIU/mL at Screening and must have a negative pregnancy test result at Screening and Day-1 (Cohort A) or Day 0 (Cohort B)
  4. Surgically sterile women (defined as those who have had a hysterectomy, bilateral salpingectomy, bilateral oophorectomy, tubal ligation, or an Essure placement with radiological confirmation test at least 90 days after procedure) must have a negative pregnancy test result at Screening and Study Day -1 (Cohort A) or Study Day 0 (Cohort B). *Subjects on hormonal birth control must not be on medications or other agents that decrease the effectiveness of hormonal birth control

• Male subjects having sexual intercourse with biologic females and who are biologically capable of fathering children must agree and commit to use male condoms from Study Day -1 until the follow-up visit on Study Day 155 (± 7). A male subject is considered capable of fathering children even if his sexual partner is sterile or using contraceptives

  a. Male subjects must refrain from sperm donation from Study Day -1 until the follow-up visit on Study Day 155 (± 7)

• Understands study and agrees to and is available for all procedures throughout the study
• Agree to follow study restrictions and are able to sign an informed consent form

Exclusion Criteria:

• Any significant medical condition who, in the opinion of the investigator, would interfere with the ability to participate in the study or increase the risk of participating for that subject based on the Investigator's Brochures and the safety profiles of AV-1 and rDEN3Δ30
• Any psychiatric condition or history of psychiatric condition that, in the opinion of the investigator or sponsor, would interfere with the subject's ability to participate in the study or increase the risk of the participation for that subject
• History of significant alcoholism or drug/chemical abuse within 12 months prior to Study Day -1 that has caused medical, occupational, or family problems as indicated by subject history
• Currently being treated for peptic ulcer disease or Helicobacter pylori or has been treated within the 6 months prior to Day -1
• Confirmed screening laboratory value of Grade 1 or above for absolute neutrophil count (ANC), alanine aminotransferase (ALT), or serum creatinine. Values of Grade 1 or above for these tests may be repeated once to confirm a Grade 1 or above value. Abnormal laboratory values other than those specified will not be exclusionary if the clinician deems them not clinically significant
• History of or suspected coagulopathy
• Alcohol consumption of >21 units* per week for males and >14 units per week for females (*1 unit of alcohol equals 12 oz [360 mL] beer, 1.5 oz [45 mL] liquor, or 5 oz [150 mL] wine) through Study Day 28
• Positive urine drug screen at Screening for drugs of abuse defined as Amphetamines, Barbiturates, Benzodiazepines, Cocaine Metabolite, Opiates, Oxycodone, Phencyclidine without confirmation of medical need verified by prescription (ie, anxiolytics or pain medications).
• Women with positive pregnancy test at either Screening visit, Study Day -1, or Study Day 0
• Seropositive for Hepatitis B surface antigen (HBsAg) or positive for Hepatitis C RNA at Screening
• Any confirmed or suspected immunosuppressive or immunodeficient condition, including, but not limited to, human immunodeficiency virus infection, or use of anti-cancer chemotherapy or radiation therapy (cytotoxic) in the 3 years prior to Screening
• Plan to travel to an area with active Zika virus (ZIKV) or DENV, transmission during the study or returned from travel to an area with active transmission within 30 days of Screening. (*Refer to the Centers for Disease Control and Prevention [CDC] website for areas with active ZIKV or DENV)
• History of vaccination with a licensed or investigational ZIKV vaccine, DENV vaccine*, yellow fever virus (YFV) vaccine, or Japanese encephalitis vaccine or reportedly diagnosed with a ZIKV or DENV infection or disease. (*Includes subject's verbal history of vaccination or disease).
• Positive serology to DENV, ZIKV, West Nile virus (WNV), YFV, or St. Louis encephalitis virus (SLE) within 60 days of Screening
• History of anaphylaxis to any drug compound, (including citrate or polysorbate), food, or other substance, unless approved by the investigator
• Major non-elective surgery within the last 3 months
• Previously treated with a licensed or investigational monoclonal or polyclonal antibody within the past 18 months prior to Study Day -1
• Received any investigational drug product within that last 28 days of Study Day -1
• Any prohibited medication within the past 28 days or plans to use prohibited medication during the study. Prohibited medications include oral/systemic anti-neoplastic agents, medications/supplements known to alter drug absorption, metabolism, or elimination processes (eg, St. John's wort), immunosuppressive drugs
• Use of any aspirin product in the 7 days prior to Study Day -1 through 14 days post-challenge
• Use of an NSAID from 48 hours prior to challenge through 14 days post-challenge
• Participants who have received or plan to receive any vaccination (live), experimental or otherwise, within the past 28 days or after Study Day -1 and 14 days (2 weeks) for inactivated vaccines and mRNA vaccines
• Has received blood products within 60 days (2 months) prior to Study Day -1 (Cohort A) or Day 0 (Cohort B)
• Has donated or lost in excess of 450 mL of blood or plasma within 56 days (8 weeks) of Study Day -1. The subject must also agree to refrain from donating blood or plasma during the study
• Has poor peripheral venous access during screening
• Has previously completed or was withdrawn from this study
• Is a current study site staff paid entirely or partially by the contract for this study, or staff who are supervised by the principal or sub-investigators
• Subjects, who in the opinion of the investigator, should not participate in this study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

6

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Group 1A prophylaxis	Drug: AV-1 100 mg; human monoclonal antibody (mAb) intravenous solution or; Drug: Placebo; (0.9% saline intravenous solution) 12:2
Experimental: Group 2A prophylaxis	Drug: Placebo; (0.9% saline intravenous solution) 12:2; Drug: AV-1 300 mg; human monoclonal antibody (mAb) intravenous solution or
Experimental: Group 3A prophylaxis	Drug: Placebo; (0.9% saline intravenous solution) 12:2; Drug: AV-1 900 mg; human monoclonal antibody (mAb) intravenous solution or
Experimental: Group 1B treatment	Drug: AV-1 100 mg; human monoclonal antibody (mAb) intravenous solution or; Drug: Placebo; (0.9% saline intravenous solution) 12:2
Experimental: Group 2B treatment	Drug: Placebo; (0.9% saline intravenous solution) 12:2; Drug: AV-1 300 mg; human monoclonal antibody (mAb) intravenous solution or
Experimental: Group 3B treatment	Drug: Placebo; (0.9% saline intravenous solution) 12:2; Drug: AV-1 900 mg; human monoclonal antibody (mAb) intravenous solution or

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of Adverse Events (AEs)	Defined as any untoward medical occurrence associated with the use of a drug in humans, whether or not considered drug related	Through day 155 (±7 days)
Severity of AEs		Through day 155 (±7 days)
Incidence of Serious Adverse Events (SAEs)	Defined as an AE that is unexpected and serious as determined by the Sponsor	Through day 155 (±7 days)
Severity of SAEs		Through day 155 (±7 days)
Anti-AV-1 antibodies (ADA) Immunogenicity Testing		Through day 155 (±7 days)
Frequency of viremia	Detected by direct serum titration	Through day 155 (±7 days)
Duration of viremia	Defined as the time from the first infection to the time of the last infection	Through day 155 (±7 days)
Viral load	Measured by qRT-PCR	Through day 155 (±7 days)
Viral load	Measured by plaque assay	Through day 155 (±7 days)
Change from baseline values of diastolic blood pressure		Through day 155 (±7 days)
Change from baseline values of systolic blood pressure		Through day 155 (±7 days)
Change in baseline values of temperature		Through day 155 (±7 days)
Change in baseline values of respiration rate		Through day 155 (±7 days)
Change in baseline values of heart rate		Through day 155 (±7 days)

Secondary Outcome Measures

Outcome Measure	Time Frame
Number of participants with detectable DENV-specific IgM antibodies	Baseline through day 155 (±7 days)
Percentage of participants with detectable DENV-specific IgM antibodies	Baseline through day 155 (±7 days)
Number of participants with detectable anti-DENV NS1 IgG antibodies	Baseline through day 155 (±7 days)
Percentage of participants with detectable anti-DENV NS1 IgG antibodies	Baseline through day 155 (±7 days)
Measure AV-1 concentration in human serum by anti-idiotype enzyme-linked immunosorbent assay (ELISA)	Through day 155 (±7 days)
Area under the serum concentration-time curve (AUC) from time 0 to 48 hours post-dose of AV-1 (AUC0-48)	Up today 155 (±7 days)
AUC from time 0 to infinity of AV-1 (AUC0-inf)	Up to day 155 (±7 days)
AUC from time 0 to the time of the last quantifiable concentration of AV-1 (AUC 0- tlast)	Baseline through day 155 (±7 days)
Maximum observed serum concentration of AV-1 (Cmax)	Baseline through day 155 (±7 days)
Time to Cmax of AV-1 (Tmax)	Baseline through day 155 (±7 days)
Apparent serum terminal elimination half-life of AV-1 (t1/2)	Baseline through day 155 (±7 days)
Total serum clearance of AV-1 (CL)	Baseline through day 155 (±7 days)
Volume of distribution during the terminal phase of AV-1 (Vz)	Baseline through day 155 (±7 days)

Collaborators and Investigators

• Sponsor: AbViro LLC
• Investigators: Study Director: Urban Ramstedt, PhD, AbViro LLC

Study record dates

Study Major Dates

• Study Start (Actual): January 7, 2025
• Primary Completion (Actual): March 11, 2026
• Study Completion (Actual): March 11, 2026

Study Registration Dates

• First Submitted: January 24, 2025
• First Submitted That Met QC Criteria: January 24, 2025
• First Posted (Actual): January 29, 2025

Study Record Updates

• Last Update Posted (Actual): March 31, 2026
• Last Update Submitted That Met QC Criteria: March 26, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Safety; Monoclonal antibody; Efficacy; Healthy Volunteers; Dengue; AV-1
• Additional Relevant MeSH Terms: Vector Borne Diseases; Mosquito-Borne Diseases; Infections; RNA Virus Infections; Virus Diseases; Arbovirus Infections; Flavivirus Infections; Flaviviridae Infections; Hemorrhagic Fevers, Viral; Dengue
• Other Study ID Numbers: AV1-PPD-0006

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No