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ClinicalTrials.gov public records Last synced Oct 19, 2026, 1:39 AM EDT

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Showing 1–9 of 9 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: VXA Placebo Tablets Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Ph 1b: Safety & Immunogenicity of Ad5 Based Oral Norovirus Vaccine

NCT04854746
View directory record Official record
Conditions
Norovirus Infections
Interventions
VXA-GI.1.NN, Placebo Tablet
Biological
Lead sponsor
Vaxart
Industry
Eligibility
55 Years to 80 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
3
States / cities
Cypress, California • New Orleans, Louisiana • Austin, Texas
Source: ClinicalTrials.gov public record
Updated Feb 13, 2023 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

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

NCT02830932
View directory record Official record
Conditions
Respiratory Syncytial Virus (RSV)
Interventions
VXA-RSV-f Tablets (high dose), VXA Placebo Tablets, VXA-RSV-f Tablets (low dose)
Biological · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Melbourne, Florida
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Phase 2 Influenza A Challenge Study Following Oral Administration of an H1N1 HA Ad-Vector Seasonal Flu Vaccine

NCT02918006
View directory record Official record
Conditions
Influenza
Interventions
VXA-A1.1, Fluzone®, Placebo Tablets, Saline Solution for Placebo IM Injection
Biological · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
179 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Costa Mesa, California
Source: ClinicalTrials.gov public record
Updated Oct 6, 2022 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

A Study to Determine the Safety and Immunogenicity of Bivalent GI.1 and GII.4 Vaccines in Healthy Volunteers

NCT05626803
View directory record Official record
Conditions
Norovirus Infections
Interventions
Open label Bivalent GII.4/GI.1 high dose vaccine 2×10 to the power 11 IU/dose, Bivalent GII.4/GI.1 high dose vaccine 2×10 to the power 11 IU/dose, Bivalent GII.4/GI.1 medium dose vaccine 1×10 to the power 11 IU/dose, Placebo
Drug
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 80 Years
Enrollment
135 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
3
States / cities
Long Beach, California • Lenexa, Kansas • Saint Paul, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 15, 2025 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Phase 1 Placebo-controlled, Randomized Trial of an Adenoviral-vector Based Norovirus Vaccine

NCT02868073
View directory record Official record
Conditions
Norovirus Gastroenteritis
Interventions
VXA-G1.1-NN (high dose) Oral Vaccine Tablet, VXA Placebo Tablets, VXA-G1.1-NN (low dose) Oral Vaccine Tablet
Biological · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated May 31, 2018 · Synced Oct 19, 2026, 1:39 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

A Ph 2 Trial With an Oral Tableted COVID-19 Vaccine

NCT05067933
View directory record Official record
Conditions
COVID-19
Interventions
VXA-CoV2-1.1-S, Placebo Tablets
Drug · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 75 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
4
States / cities
Long Beach, California • Wichita, Kansas • Cleveland, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 13, 2025 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety & Immunogenicity Study of Ad5 Based Oral Norovirus Vaccines

NCT03897309
View directory record Official record
Conditions
Norovirus Infection
Interventions
VXA-G1.1-NN, VXA-G2.4-NS, Placebo Tablets
Biological
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 21, 2022 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Norovirus Challenge Study

NCT05212168
View directory record Official record
Conditions
Norovirus Infections
Interventions
VXA-G1.1-NN, Placebo Tablets, Norovirus GI.1 Norwalk Virus Inoculum
Biological · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Cypress, California
Source: ClinicalTrials.gov public record
Updated Nov 5, 2025 · Synced Oct 19, 2026, 1:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety Study of an Oral Vaccine to Prevent Seasonal Influenza

NCT01688297
View directory record Official record
Conditions
Influenza
Interventions
VXA-A1.1 Oral Vaccine, VXA Placebo Tablet
Biological
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 49 Years
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
Cypress, California
Source: ClinicalTrials.gov public record
Updated May 12, 2017 · Synced Oct 19, 2026, 1:39 AM EDT