deltatrials
Active Not Recruiting OBSERVATIONAL NCT05110911

Does Repeat Influenza Vaccination Constrain Influenza Immune Responses and Protection

Sponsor: London School of Hygiene and Tropical Medicine

Conditions Influenza, Human SARS-CoV-2 Infection
Interventions Influenza vaccination: Fluarix Tetra, Vaxigrip Tetra, Fluquadri, Fluad Quad, Afluia Quad, Flucelvax Quad SARS-CoV-2 vaccination: Comirnaty or Vaxzevria
Updated 6 times since 2021 Last updated: Mar 26, 2025 Started: Apr 2, 2020 Primary completion: Jun 30, 2025 Completion: Jun 30, 2025
This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

This observational or N/A phase trial investigates Influenza, Human and SARS-CoV-2 Infection and is currently ongoing. London School of Hygiene and Tropical Medicine leads this study, which shows 6 recorded versions since 2020 — indicating limited longitudinal coverage. Longitudinal tracking of infectious disease trials helps identify durability of treatment effects.

Status Flow

~Dec 2021 – ~Dec 2022 · 12 months · monthly snapshotRecruiting~Dec 2022 – ~Jul 2024 · 19 months · monthly snapshotRecruiting~Jul 2024 – ~Sep 2024 · 2 months · monthly snapshot~Sep 2024 – ~Dec 2024 · 3 months · monthly snapshot~Dec 2024 – ~May 2025 · 5 months · monthly snapshotUnknown~May 2025 – present · 14 months · monthly snapshotActive Not Recruiting

Change History

6 versions recorded

  1. May 2025 — Present [monthly]

    Active Not Recruiting

    Status: Unknown → Active Not Recruiting

  2. Dec 2024 — May 2025 [monthly]

    Unknown

    Status: Recruiting → Unknown

  3. Sep 2024 — Dec 2024 [monthly]

    Recruiting

  4. Jul 2024 — Sep 2024 [monthly]

    Recruiting

  5. Dec 2022 — Jul 2024 [monthly]

    Recruiting

▶ Show 1 earlier version

  1. Dec 2021 — Dec 2022 [monthly]

    Recruiting

    First recorded

Apr 2020

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:
  • London School of Hygiene and Tropical Medicine
  • Sydney Children's Hospitals Network
  • The Alfred
  • The University of Queensland
  • The University of Western Australia
  • University of Adelaide
  • University of Melbourne
  • University of Newcastle, Australia
Data source: University of Melbourne

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

Study Locations