Study of the Safety and Immunogenicity of NasoVAX Extension

June 18, 2025 updated by: Altimmune, Inc.

Extension Study for Study ALT-103-201: One-year Follow-up for the 1×10(11th) vp NasoVAX Group

This study is an extension to Study ALT-103-201, a Phase 2a, randomized, double-blind, placebo-controlled trial to evaluate the safety and immunogenicity of NasoVAX in healthy adults 18 to 49 years of age.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This study is an extension to Study ALT-103-201 to evaluate immunogenicity of NasoVAX administered by intranasal spray at a single dose of 1×1011 vp at Day 366 (± 60 days). Up to 15 subjects who received NasoVAX at the 1×10(11th) vp dose in Study ALT-103-201 will be screened, and a serum sample will be collected from each eligible subject for evaluation of influenza HAI assay against influenza A/California/07/2009(H1N1), a strain homologous to the one used for NasoVAX (monovalent AdcoCA09.HA). Ad5 antibody neutralization assay may also be performed.

Study Type

Observational

Enrollment (Actual)

8

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Maryland
      • Rockville, Maryland, United States, 20850
        • Optimal Health Research

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 50 years (Adult)

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

All subjects who were previously randomized to the 1×10(11th) vp NasoVAX group in Study ALT-103-201

Description

Inclusion:

  1. Receipt of NasoVAX at the 1×10(11th) vp dose in Study ALT-103-201
  2. Adequate venous access for phlebotomy
  3. Provision of written informed consent

Exclusion:

1. Any medical, psychiatric, or social condition or occupational or other responsibility that in the judgment of the Investigator would interfere with the subject providing an adequate blood sample or the subject's ability to give informed consent

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Other
  • Time Perspectives: Other

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Extension of NasoVAX high dose
A serum sample will be collected from each eligible subject who received NasoVAX at the 1×10(11th) vp dose in Study ALT-103-201 for evaluation of influenza hemagglutination assay against influenza A/California/07/2009(H1N1), a strain homologous to the one used for NasoVAX (monovalent AdcoCA09.HA). Ad5 antibody neutralization assay may also be performed.
Drug: Subjects were administered NasoVAX high dose
NasoVAX administered by intranasal spray at a single dose of 1×10(11th) viral particles (vp) versus placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Immune response to NasoVAX when administered by intranasal spray at a single dose of 1×10(11th) vp after approximately 1year
Time Frame: Day 366
Antibody level measured by hemagglutination inhibition titer
Day 366

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Persistence of antivector immune response following NasoVAX administered by intranasal spray at a single 1×10(11th) vp dose after approximately 1year
Time Frame: Day 366
Antibody level measured by Adenovirus serotype 5 neutralization
Day 366

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Altimmune, Inc.

Investigators

  • Principal Investigator: Peta-Gay Jackson-Booth, MD, Study Principal Investigator

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 21, 2019

Primary Completion (Actual)

February 18, 2019

Study Completion (Actual)

February 18, 2019

Study Registration Dates

First Submitted

November 28, 2018

First Submitted That Met QC Criteria

November 29, 2018

First Posted (Actual)

November 30, 2018

Study Record Updates

Last Update Posted (Actual)

June 19, 2025

Last Update Submitted That Met QC Criteria

June 18, 2025

Last Verified

June 1, 2025

More Information

Terms related to this study

Other Study ID Numbers

  • ALT103-201EXT

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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