deltatrials
Completed PHASE1/PHASE2 INTERVENTIONAL 9-arm NCT04491877

Study of an Live-Attenuated Respiratory Syncytial Virus Vaccine in Infants and Toddlers (VAD00001)

Safety, Immunogenicity, Infectivity, and Dose-Finding Study of an Investigational Live-Attenuated Respiratory Syncytial Virus (RSV) Vaccine in Infants and Toddlers

Sponsor: Sanofi Pasteur, a Sanofi Company

Conditions Respiratory Syncytial Virus Infection
Interventions Placebo RSV vaccine formulation 1 RSV vaccine formulation 2
Updated 27 times since 2020 Last updated: Sep 8, 2025 Started: Sep 17, 2020 Primary completion: Apr 13, 2023 Completion: Apr 13, 2023
This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

A PHASE1/PHASE2 clinical study on Respiratory Syncytial Virus Infection, this trial is completed. The trial is conducted by Sanofi Pasteur, a Sanofi Company and has accumulated 27 data snapshots since 2020. Infectious disease trials contribute critical data for public health response and treatment development.

Status Flow

~Aug 2020 – ~Sep 2020 · 31 days · monthly snapshot~Sep 2020 – ~Oct 2020 · 30 days · monthly snapshot~Oct 2020 – ~Nov 2020 · 31 days · monthly snapshot~Nov 2020 – ~Dec 2020 · 30 days · monthly snapshot~Dec 2020 – ~Jan 2021 · 31 days · monthly snapshot~Jan 2021 – ~Feb 2021 · 31 days · monthly snapshot~Feb 2021 – ~Mar 2021 · 28 days · monthly snapshot~Mar 2021 – ~Apr 2021 · 31 days · monthly snapshot~Apr 2021 – ~May 2021 · 30 days · monthly snapshot~May 2021 – ~Sep 2021 · 4 months · monthly snapshot~Sep 2021 – ~Nov 2021 · 2 months · monthly snapshot~Nov 2021 – ~Jan 2022 · 2 months · monthly snapshot~Jan 2022 – ~Feb 2022 · 31 days · monthly snapshot~Feb 2022 – ~Mar 2022 · 28 days · monthly snapshot~Mar 2022 – ~Apr 2022 · 31 days · monthly snapshot~Apr 2022 – ~May 2022 · 30 days · monthly snapshot~May 2022 – ~Jun 2022 · 31 days · monthly snapshot~Jun 2022 – ~Sep 2022 · 3 months · monthly snapshot~Sep 2022 – ~Nov 2022 · 2 months · monthly snapshot~Nov 2022 – ~Feb 2023 · 3 months · monthly snapshot~Feb 2023 – ~Apr 2023 · 59 days · monthly snapshot~Apr 2023 – ~Jun 2023 · 2 months · monthly snapshot~Jun 2023 – ~Oct 2023 · 4 months · monthly snapshot~Oct 2023 – ~Jul 2024 · 9 months · monthly snapshot~Jul 2024 – ~Sep 2024 · 2 months · monthly snapshot~Sep 2024 – ~Oct 2025 · 13 months · monthly snapshot~Oct 2025 – present · 7 months · monthly snapshot

Change History

27 versions recorded

  1. Oct 2025 — Present [monthly]

    Completed PHASE1/PHASE2

  2. Sep 2024 — Oct 2025 [monthly]

    Completed PHASE1/PHASE2

  3. Jul 2024 — Sep 2024 [monthly]

    Completed PHASE1/PHASE2

    Phase: PHASE2 → PHASE1/PHASE2

  4. Oct 2023 — Jul 2024 [monthly]

    Completed PHASE2

  5. Jun 2023 — Oct 2023 [monthly]

    Completed PHASE2

    Status: Active Not Recruiting → Completed

▶ Show 22 earlier versions

  1. Apr 2023 — Jun 2023 [monthly]

    Active Not Recruiting PHASE2

    Status: Recruiting → Active Not Recruiting

  2. Feb 2023 — Apr 2023 [monthly]

    Recruiting PHASE2

  3. Nov 2022 — Feb 2023 [monthly]

    Recruiting PHASE2

  4. Sep 2022 — Nov 2022 [monthly]

    Recruiting PHASE2

  5. Jun 2022 — Sep 2022 [monthly]

    Recruiting PHASE2

  6. May 2022 — Jun 2022 [monthly]

    Recruiting PHASE2

  7. Apr 2022 — May 2022 [monthly]

    Recruiting PHASE2

  8. Mar 2022 — Apr 2022 [monthly]

    Recruiting PHASE2

    Phase: PHASE1_PHASE2 → PHASE2

  9. Feb 2022 — Mar 2022 [monthly]

    Recruiting PHASE1_PHASE2

  10. Jan 2022 — Feb 2022 [monthly]

    Recruiting PHASE1_PHASE2

  11. Nov 2021 — Jan 2022 [monthly]

    Recruiting PHASE1_PHASE2

  12. Sep 2021 — Nov 2021 [monthly]

    Recruiting PHASE1_PHASE2

  13. May 2021 — Sep 2021 [monthly]

    Recruiting PHASE1_PHASE2

  14. Apr 2021 — May 2021 [monthly]

    Recruiting PHASE1_PHASE2

  15. Mar 2021 — Apr 2021 [monthly]

    Recruiting PHASE1_PHASE2

  16. Feb 2021 — Mar 2021 [monthly]

    Recruiting PHASE1_PHASE2

  17. Jan 2021 — Feb 2021 [monthly]

    Recruiting PHASE1_PHASE2

  18. Dec 2020 — Jan 2021 [monthly]

    Recruiting PHASE1_PHASE2

  19. Nov 2020 — Dec 2020 [monthly]

    Recruiting PHASE1_PHASE2

  20. Oct 2020 — Nov 2020 [monthly]

    Recruiting PHASE1_PHASE2

  21. Sep 2020 — Oct 2020 [monthly]

    Recruiting PHASE1_PHASE2

    Status: Not Yet Recruiting → Recruiting

  22. Aug 2020 — Sep 2020 [monthly]

    Not Yet Recruiting PHASE1_PHASE2

    First recorded

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:
  • Sanofi Pasteur, a Sanofi Company
Data source: Sanofi

For direct contact, visit the study record on ClinicalTrials.gov .

Study Locations

Albuquerque, United States , Blackfoot, United States , Charleston, United States , Charlottesville, United States , Covington, United States , El Dorado, United States , Gardena, United States , Greenville, United States , Idaho Falls, United States , La Mesa, United States and 16 more locations