Clinical Trial

Study of Immune Responses to Influenza Vaccination

Recruiting Phase 4
View on ClinicalTrials.gov →
Record status
This record was last updated August 19, 2025 (before its estimated July 1, 2026 completion). Its status may not reflect the trial's current state.
Summary
Better understanding of the immune responses to influenza vaccination is needed in order to understand situations of poor vaccine response. Adults will receive influenza vaccination and then have peripheral blood drawn at pre-defined intervals in order to study the lymphocyte responses.
Protocol Amendment History 9 amendments
This ClinicalTrials.gov record has been amended 9 times since 2017-11-16; most recent amendment 2025-08-13.
Status change: Enrolling by Invitation → Recruiting 2021-04-07
Status change: Recruiting → Enrolling by Invitation 2019-01-02
Trial Details
NCT Number NCT03346772
Lead Sponsor University of Pennsylvania
Conditions Influenza Vaccination
Enrollment 75 participants
Start Date 2017-10-20
Primary Completion 2026-07-01 (estimated)
Study Completion 2026-07-01 (estimated)
Updated on ClinicalTrials.gov 2025-08-19