Dose-Ranging Trial of Safety & Immunogenicity of an Oral Adenoviral-Vector Based RSV Vaccine (VXA-RSV-f)

Vaxart66 enrolled

Overview

A Phase 1, Randomized, Double-Blind, Placebo-Controlled, Dose-Ranging Trial to Determine the Safety and Immunogenicity of an Adenoviral-Vector Based Respiratory Syncytial Virus (RSV) F Protein Vaccine (VXA-RSV-f) Expressing Protein F and dsRNA Adjuvant Administered Orally to Healthy Volunteers

The study will enroll 66 subjects in four cohorts. All subjects will receive a single administration of VXA-RSV-f at a low dose, a high dose or placebo. Two sentinel groups will enroll 3 subjects each in an open-label manner (Cohorts 1 and 3) to receive VXA-RSV-f prior to enrolling either of the randomized, controlled cohorts (Cohorts 2 and 4). Within the double-blinded Cohorts (2 and 4), placebo subjects will receive the same number of tablets as the vaccine subjects in that Cohort. Subjects will be enrolled and dosed in the low dose groups prior to initiation of dosing in the high dose group. Cohort 1: 3 subjects at low dose Cohort 2: 20 subjects at low dose and 10 placebo Cohort 3: 3 subjects at high dose Cohort 4: 20 subjects at low dose and 10 placebo Subjects will be followed for 28 days post vaccination for preliminary immunogenicity. Subjects will continue to be followed for 1 year post-vaccination for long term safety.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

QUADRUPLE

Enrollment

Conditions

Respiratory Syncytial Virus (RSV)

Interventions

VXA-RSV-f Tablets (high dose)BIOLOGICAL

The drug product will be provided as small white enteric-coated tablets. Multiple tablets may be administered to delivered the high dose.

VXA Placebo TabletsOTHER

The placebo will be provided as small white enteric-coated tablets that are similar in size and number to the active drug product tablets.

VXA-RSV-f Tablets (low dose)BIOLOGICAL

The drug product will be provided as small white enteric-coated tablets. Multiple tablets may be administered to delivered the low dose

Eligibility

Sex: ALLMin age: 18 YearsMax age: 49 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. Male or female volunteers aged 18 - 49 years, inclusive 2. Able to give written informed consent 3. Healthy (no clinically significant health concerns) 4. Safety laboratory values within the following range criteria normal range 5. Body mass index between 17 and 35 at screening Exclusion Criteria: 1. Receipt of any investigational RSV vaccine within two years prior to study 2. Receipt of any investigational vaccine, drug or device within 8 weeks preceding vaccination 3. Administration of any licensed vaccine within 30 days prior to study 4. Presence of significant uncontrolled medical or psychiatric illness (acute or chronic) including institution of new medical/surgical treatment or significant dose alteration for uncontrolled symptoms or drug toxicity within 3 months of screening and reconfirmed at baseline 5. History of drug, alcohol or chemical abuse within 1 year prior to vaccination 6. Presence of a fever ≥ 38oC measured orally at baseline 7. Stool sample with occult blood at screening

Locations (1)

Optimal Research

Melbourne, Florida, United States

Outcomes

Primary Outcomes

Systemic Reactogenicity of VXA-RSV-f vaccine delivered by oral enteric tablet.

Number of Patients with Systemic Reactogenicity Symptoms

Time frame: Day 7

Secondary Outcomes

Immunogenicity of VXA-RSV-f vaccine delivered by oral enteric tablet.

Number of Patients with a \>/= 4-fold Increase in Serum Neutralizing Antibodies from Baseline as determined by PRNT Assay

Time frame: Day 28

Immunogenicity of VXA-RSV-f vaccine delivered by oral enteric tablet (GMT)

Mean Geometric Mean Titer

Time frame: Days 7 and 28

Immunogenicity of VXA-RSV-f vaccine delivered by oral enteric tablet (GMFR)

Mean Geometric Mean Fold Rise

Time frame: Days 7 and 28

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.