Safety and Immunogenicity of CodaVax-RSV in Seropositive and Seronegative Children

Phase 1

Active, not recruiting

• Conditions: Respiratory Syncytial Virus Infections
• Interventions: Biological: CodaVax-RSV; Biological: Normal Saline

• Registration Number: NCT04919109
• Lead Sponsor: Codagenix, Inc

Brief Summary

This study is a Phase 1, randomized, double-blind, placebo-controlled, dose-escalation clinical trial to evaluate the safety of and immune response to CodaVax-RSV in healthy children. They will be vaccinated in spring to early autumn 2023 and followed through the 2023-24 RSV season. 18 children aged 2 to 5 years who are RSV-seropositive (have antibodies to RSV) and 33 children aged 6 months to \< 2 years who are RSV-seronegative (do not have antibodies to RSV) will be enrolled in escalating-dose cohorts. A safety committee will review the safety profile of each dosing group before the next dose-escalation. Children will receive 2 doses of the vaccine at one of several dose levels or placebo (saline solution with no active ingredient) as nose drops; doses will be 28 days apart.

A parent/guardian will record temperature and other conditions in a diary daily for 7 days after each dose. The parent/guardian will be contacted by telephone on the day after Dose 1 for safety assessment and review of the diary data. Children will return to the clinic 3, 7, 14, and 28 days after each dose. The parent/guardian will then be contacted by telephone monthly until 1 year after the second dose.

Study procedures include physical examinations, vital signs, and collections of blood and nose/throat swab samples to look at safety of the vaccine and to analyze body's immune response.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2021-05-26
• Study First Submitted QC: 2021-06-02
• Study First Posted: 2021-06-09
• Study Start: 2023-03-28
• Status Verified: 2025-02
• Last Update Submitted: 2025-02-04
• Last Update Posted: 2025-02-06
• Primary Completion: 2025-04-30
• Study Completion: 2025-08-27

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 51

Inclusion Criteria

1. Age at the time of informed consent:

   • Part A: 2 to 5 years, inclusive
   • Part B: 6 months to < 2 years

2. RSV Status at Screening:

   • Part A: RSV-seropositive
   • Part B: RSV-seronegative

3. Good general health status

4. Product of normal full-term pregnancy (36 to 42 weeks gestation)

Exclusion Criteria

1. Household contact with any of the following groups of individuals for the period up to 14 days after each dose:

   • Pregnant women

   • Infants < 6 months of age

   • With hospitalization for asthma or other chronic respiratory disease in the past 5 years

   • Immunocompromised individuals, which includes, but is not limited to, those with the following conditions:

     • AIDS
     • Receipt of chemotherapy within the past 6 months
     • Current receipt of immunosuppressive agents
     • Solid organ or bone marrow transplant

2. Enrolled in the same classroom at full-time day care with infants < 6 months of age for 14 days after each dose

3. Household contact of another child enrolled into the study

4. Inadequate venous access for repeated phlebotomy

5. Height and weight ≤ 5th percentile for age and sex (according to CDC growth charts for children in Part A, according to World Health Organization Child Growth Standards for children in Part B)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Experimental: CodaVax-RSV 10^5 PFU	CodaVax-RSV	Respiratory syncytial virus live attenuated vaccine against RSV administered as nose drops
Experimental: CodaVax-RSV 10^3 PFU	CodaVax-RSV	Respiratory syncytial virus live attenuated vaccine against RSV administered as nose drops
Placebo comparator	Normal Saline	Administered as nose drops
Experimental: CodaVax-RSV 10^6 PFU	CodaVax-RSV	Respiratory syncytial virus live attenuated vaccine against RSV administered as nose drops
Experimental: CodaVax-RSV 10^4 PFU	CodaVax-RSV	Respiratory syncytial virus live attenuated vaccine against RSV administered as nose drops

Primary Outcome Measures

Name	Time	Method
Number of participants with Medically attended AEs (MAAEs), new-onset chronic illnesses (NCIs), and serious AEs (SAEs)	Days 210	counts
Number of participants reporting expected adverse reactions	Day 36	Reactogenicity Event Counts
Number of participant reported adverse events	Days 57	Adverse event counts

Secondary Outcome Measures

Name	Time	Method
Neutralizing antibody	Screening, Days 29 and 57	Neutralizing antibody level

Trial Locations

Locations (2)

Velocity; 🇺🇸 West Jordan, Utah, United States

University of Witwatersrand (WITS)/Vaccines and Infectious Diseases Analytics (VIDA); 🇿🇦 Johannesburg, South Africa