A Study on the Safety, Reactogenicity and Immune Response of a Vaccine Against Influenza in Healthy Younger and Older Adults

Dose level 1 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A Dose level 1 and OA GSK4382276A Selected Dose level from YA groups, at Day 1. Potential intermediate dose levels may be evaluated, with the total number of dose levels per age group not exceeding 5.

Dose level 2 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A Dose level 2 and OA GSK4382276A Selected Dose level from YA groups, at Day 1. Potential intermediate dose levels may be evaluated, with the total number of dose levels per age group not exceeding 5.

Dose level 3 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A Dose level 3 and OA GSK4382276A Selected Dose level from YA groups, at Day 1. Potential intermediate dose levels may be evaluated, with the total number of dose levels per age group not exceeding 5.

Dose level 4 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 4 and OA GSK4382276A Dose level 4 groups, at Day 1. Potential intermediate dose levels may be evaluated, with the total number of dose levels per age group not exceeding 5.

Dose level 6 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 6 group, at Day 1.

Dose level 7 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 7 group, at Day 1.

Dose level 8 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 8 group, at Day 1. Potential intermediate dose levels may be evaluated with the total number of dose levels not exceeding 10 in YA and 1 in OA.

Dose level 9 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 9 group, at Day 1. Potential intermediate dose levels may be evaluated with the total number of dose levels not exceeding 10 in YA and 1 in OA.

Dose level 10 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 10 group, at Day 1.

Dose level 11 of GSK4382276A is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA GSK4382276A level 11 group, at Day 1.

Single dose of FDQ21A-NH is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA Control 1 and OA Control groups, at Day 1.

Single dose of FDQ21A-NH is administered intramuscularly in the upper deltoid region of the non-dominant arm to participants in YA Control 2, at Day 1.