Table of Contents
- Trial overview
- Who participated
- What was studied
- Trial phase and status
- Endpoints and what they mean
- Comparators and study design
Trial overview
The main study in the source data is NCT05823974, a completed interventional trial of GSKVX000000040033 in healthy younger and older adults.[1] The study title says it was designed to find and confirm the dose and to assess safety, reactogenicity, and immune response for an influenza vaccine.[1]
Who participated
The trial enrolled healthy volunteers, including younger and older adults.[1] The condition listed in the source is prevention of influenza infection, so the study was not for people already sick with influenza.[1]
What was studied
The source data shows that GSKVX000000040033 was studied as part of a vaccine program for influenza prevention.[1] The brief summary says the trial aimed to evaluate the safety and reactogenicity profile of the investigational study intervention and the humoral immune response it induced.[1] Humoral immune response means the antibody response in the blood.[1]
Trial phase and status
The study was a Phase 1/2 trial, which usually means early testing in people to learn about safety and early signs of immune response.[1] The trial status is listed as Completed.[1] The enrollment was 1272 participants.[1]
Endpoints and what they mean
The trial measured several safety outcomes, including solicited administration site events and solicited systemic events from Day 1 to Day 7.[1] Solicited events are side effects that researchers ask about on purpose after vaccination, such as pain where the shot was given or body-wide symptoms like fever or tiredness.[1]
The study also measured unsolicited adverse events from Day 1 to Day 28, plus serious adverse events, adverse events of special interest, and medically attended events through Day 183.[1] These terms mean, respectively, any extra unwanted health problem reported by the participant, severe medical problems, side effects that need special monitoring, and health problems that lead to medical care.[1]
For laboratory safety, the Phase 1 part of the study checked whether a non-clinically significant lab value on Day 1 changed to a clinically significant abnormal value on Day 8 and/or Day 29 for hematology and clinical chemistry.[1] Hematology means blood tests, and clinical chemistry means tests that measure substances in the blood such as salts, sugar, and organ-related markers.[1]
The immune response outcomes included geometric mean titer (GMT), geometric mean increase (GMI), seroconversion rate (SCR), and the percentage of participants with antibody levels above a cut-off value at Day 1 and Day 29.[1] These results were reported for antigen 1 and antigen 2, showing that the study looked at how strongly the immune system responded to more than one vaccine target.[1]
Comparators and study design
The intervention list shows that the study included GSKVX000000040033 in different vaccine combinations and also compared it with licensed influenza vaccines such as Alpharix-Tetra and EFLUELDA.[1] This kind of comparison helps researchers see how the investigational vaccine performs against existing vaccines in healthy adults.[1]
The source data does not provide more details about randomization, masking, or exact dose groups, so those points are not described here.[1]



