Study: NCT06431607

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 1
Description: 1 dose of Flu mRNA Formulation 1 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 2
Description: 1 dose of Flu mRNA Formulation 2 is administered intramuscularly in the non-dominant upper deltoid to YA at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 3
Description: 1 dose of Flu mRNA Formulation 3 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 4
Description: 1 dose of Flu mRNA Formulation 4 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 5
Description: 1 dose of Flu mRNA Formulation 5 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 6
Description: 1 dose of Flu mRNA Formulation 6 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 7
Description: 1 dose of Flu mRNA Formulation 7 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 8
Description: 1 dose of Flu mRNA Formulation 8 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: COMBINATION_PRODUCT
Group type: ACTIVE_COMPARATOR
Intervention: Active Comparator 1
Description: 1 dose of active comparator 1 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: COMBINATION_PRODUCT
Group type: ACTIVE_COMPARATOR
Intervention: Active Comparator 2
Description: 1 dose of active comparator 2 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 9
Description: 1 dose of Flu mRNA Formulation 9 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Seasonal mRNA Formulation 10
Description: 1 dose of Flu mRNA Formulation 10 is administered intramuscularly in the non-dominant upper deltoid to OA participants at Day 1.

Intervention type: COMBINATION_PRODUCT
Group type: ACTIVE_COMPARATOR
Intervention: Active Comparator 3
Description: 1 dose of active comparator 3 is administered intramuscularly in the non-dominant upper deltoid to YA participants at Day 1.

Intervention type: COMBINATION_PRODUCT
Group type: ACTIVE_COMPARATOR
Intervention: Active Comparator 4
Description: 1 dose of active comparator 4 is administered intramuscularly in the non-dominant upper deltoid to OA at Day1.