Study: NCT06382311

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_ Dose level 4
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 5
Description: 2 doses of study intervention are administered to participants intramuscularly. If selected as dose level 1 or dose level 2 in Phase 2 Part B, 1 dose is administered to participants.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 6
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 6
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 6
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 6
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 7
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 7
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 7
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: BIOLOGICAL
Group type: EXPERIMENTAL
Intervention: Flu Pandemic mRNA_Dose level 7
Description: 1 dose of study intervention is administered to participants intramuscularly.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Placebo
Description: 2 doses of Placebo are administered intramuscularly to participants in Phase 1 and Phase 2 Part A and 1 dose is administered to participants in Phase 2 Part B.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Placebo
Description: 2 doses of Placebo are administered intramuscularly to participants in Phase 1 and Phase 2 Part A and 1 dose is administered to participants in Phase 2 Part B.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Placebo
Description: 2 doses of Placebo are administered intramuscularly to participants in Phase 1 and Phase 2 Part A and 1 dose is administered to participants in Phase 2 Part B.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Placebo
Description: 2 doses of Placebo are administered intramuscularly to participants in Phase 1 and Phase 2 Part A and 1 dose is administered to participants in Phase 2 Part B.