Assessed solicited local symptoms are pain, erythema and swelling. Any = occurrence of the symptom regardless of intensity grade. Any erythema/swelling = erythema/swelling spreading beyond 20 millimeters (mm) of injection site.

Assessed solicited local symptoms are pain, erythema and swelling. Any = occurrence of the symptom regardless of intensity grade. Any erythema/swelling = erythema/swelling spreading beyond 20 millimeters (mm) of injection site.

Assessed solicited local symptoms are pain, erythema and swelling. Any = occurrence of the symptom regardless of intensity grade. Any erythema/swelling = erythema/swelling spreading beyond 20 mm of injection site.

Assessed solicited general symptoms are arthralgia, fatigue, gastrointestinal symptoms, headache, myalgia, shivering and fever \[defined as oral temperature equal to or above 38.0 degrees Celsius (°C)\]. Any = occurrence of the symptom regardless of intensity grade

Assessed solicited general symptoms are arthralgia, fatigue, gastrointestinal symptoms, headache, myalgia, shivering and fever \[defined as oral temperature equal to or above 38.0 degrees Celsius (°C)\]. Any = occurrence of the symptom regardless of intensity grade

Assessed solicited general symptoms are arthralgia, fatigue, gastrointestinal symptoms, headache, myalgia, shivering and fever \[defined as oral temperature equal to or above 38.0 degrees Celsius (°C)\]. Any = occurrence of the symptom regardless of intensity grade.

An unsolicited AE covers any untoward medical occurrence in a clinical investigation subject temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product and reported in addition to those solicited during the clinical study and any solicited symptom with onset outside the specified period of follow-up for solicited symptoms. Any is defined as the occurrence of any unsolicited AE regardless of intensity grade or relation to vaccination

Hematological parameters assessed are: Eosinophils increase \[EOSi\], hemoglobin decrease \[HEMd\] , lymphocytes decrease \[LYMd\], Neutrophils decrease \[NEUd\], platelets decrease \[PLTCd\], white blood cells decrease \[WBCd\], WBC increase \[WBCi\]. Biochemical parameters assessed are: alanine aminotransferase increase \[ALTi\], aspartate aminotransferase increase \[ASTi\], blood urea nitrogen \[BUN\], creatinine \[CRE\].Toxicity grading is according to the Food and Drug Administration (FDA) guidance for industry: Toxicity grading scale for healthy adult and adolescent volunteers enrolled in preventive vaccine clinical Trials (September 2007). The grading scale is defined as follows: mild (Grade 1), moderate (Grade 2), severe (Grade 3) and potentially life threatening (Grade 4). Category naming has been defined as follows: Parameter- grading at Baseline- grading at Timing: e.g.: "ALT-Grade 0-Grade 1".

Hematological parameters assessed are: EOSi, HEMd, LYMd, NEUd, PLTCd, WBCd, WBCi. Biochemical parameters assessed are: ALTi, ASTi, BUN, CRE. Toxicity grading is according to the FDA guidance for industry: Toxicity grading scale for healthy adult and adolescent volunteers enrolled in preventive vaccine clinical Trials (September 2007). The grading scale is defined as following: mild (Grade 1), moderate (Grade 2), severe (Grade 3) and potentially life threatening (Grade 4). Category naming has been defined as: Parameter-grading at Baseline-grading at Timing: e.g.: "ALT-Grade 0-Grade 1". The reported results consider any change that occurred during the defined time frame: i.e. any abnormality occurring at an intermediate visit leading to a maximum change from baseline, during the period covered, is the reported result for the outcome.

Hematological parameters assessed are: EOSi, HEMd, LYMd, NEUd, PLTCd, WBCd, WBCi. Biochemical parameters assessed are: ALTi, ASTi, BUN, CRE. Toxicity grading is according to the FDA guidance for industry: Toxicity grading scale for healthy adult and adolescent volunteers enrolled in preventive vaccine clinical Trials (September 2007). The grading scale is defined as following: mild (Grade 1), moderate (Grade 2), severe (Grade 3) and potentially life threatening (Grade 4). Category naming has been defined as: Parameter-grading at Baseline-grading at Timing: e.g.: "ALT-Grade 0-Grade 1". The reported results consider any change that occurred during the defined time frame: i.e. any abnormality occurring at an intermediate visit leading to a maximum change from baseline, during the period covered, is the reported result for the outcome.

Hematological parameters assessed are: EOSi, HEMd, LYMd, NEUd, PLTCd, WBCd, WBCi. Biochemical parameters assessed are: ALTi, ASTi, BUN, CRE. Toxicity grading is according to the FDA guidance for industry: Toxicity grading scale for healthy adult and adolescent volunteers enrolled in preventive vaccine clinical Trials (September 2007). The grading scale is defined as following: mild (Grade 1), moderate (Grade 2), severe (Grade 3) and potentially life threatening (Grade 4). Category naming has been defined as: Parameter-grading at Baseline-grading at Timing: e.g.: "ALT-Grade 0-Grade 1". The reported results consider any change that occurred during the defined time frame: i.e. any abnormality occurring at an intermediate visit leading to a maximum change from baseline, during the period covered, is the reported result for the outcome.

Hematological parameters assessed are: EOSi, HEMd, LYMd, NEUd, PLTCd, WBCd, WBCi. Biochemical parameters assessed are: ALTi, ASTi, BUN, CRE. Toxicity grading is according to the FDA guidance for industry: Toxicity grading scale for healthy adult and adolescent volunteers enrolled in preventive vaccine clinical Trials (September 2007). The grading scale is defined as following: mild (Grade 1), moderate (Grade 2), severe (Grade 3) and potentially life threatening (Grade 4). Category naming has been defined as: Parameter-grading at Baseline-grading at Timing: e.g.: "ALT-Grade 0-Grade 1". The reported results consider any change that occurred during the defined time frame: i.e. any abnormality occurring at an intermediate visit leading to a maximum change from baseline, during the period covered, is the reported result for the outcome.

MAEs are defined as events for which the subject receives medical attention defined as hospitalization, an emergency room visit, or a visit to or from medical personnel (medical doctor) for any reason. Any MAE(s) = Occurrence of any MAE(s) regardless of intensity grade or relation to vaccination.

pIMDs are a subset of AEs that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune etiology.

SAEs include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization or result in disability/incapacity.

Anti-H1 stalk immune response measured by ELISA. A seropositive subject is a subject whose concentration is greater than or equal to the cut-off value: ELISA cut-off = 66 ELISA.Unit per milliliter (EL.U/mL).

Anti-H1 stalk immune response measured by ELISA. A seropositive subject is a subject whose concentration is greater than or equal to the cut-off value: ELISA cut-off = 66 EL.U/mL.

Anti-H1 stalk immune response measured by ELISA. A seropositive subject is a subject whose concentration is greater than or equal to the cut-off value: ELISA cut-off = 66 EL.U/mL.

Concentrations are presented as Geometric Mean Concentrations (GMCs) and measured by ELISA. ELISA cut-off = 66 EL.U/mL.

Concentrations are presented as GMCs and measured by ELISA. ELISA cut-off = 66 EL.U/mL.

Concentrations are presented as GMCs and measured by ELISA. ELISA cut-off = 66 EL.U/mL.

Anti-H1 stalk immune response measured by MN are expressed in 1/DILUTION (DIL). The functionality of the stalk-reactive antibodies is evaluated by MN assays developed using chimeric viruses. A seropositive subject is a subject whose titer is greater than or equal to the cut-off value: MN cut-off = 20 1/DIL.

Anti-H1 stalk immune response measured by MN are expressed in 1/DIL. The functionality of the stalk-reactive antibodies is evaluated by MN assays developed using chimeric viruses. A seropositive subject is a subject whose titer is greater than or equal to the cut-off value: MN cut-off = 20 1/DIL.

Anti-H1 stalk immune response measured by MN are expressed in 1/DIL. The functionality of the stalk-reactive antibodies is evaluated by MN assays developed using chimeric viruses. A seropositive subject is a subject whose titer is greater than or equal to the cut-off value: MN cut-off = 20 1/DIL.

Titers are presented as GMTs and measured by MN assay. MN cut-off = 20 1/DIL.

Titers are presented as GMTs and measured by MN assay. MN cut-off = 20 1/DIL.

Titers are presented as GMTs and measured by MN assay. MN cut-off = 20 1/DIL.

Percentage of subjects with an equal or greater than (≥) 4-fold increase of anti-H1 stalk antibody concentration, from Day 1, is calculated with exact 95% CI by ELISA.

Percentage of subjects with a ≥ 4-fold increase of anti-H1 stalk antibody concentration, from Day 1, is calculated with exact 95% CI by ELISA.

Percentage of subjects with a ≥ 4-fold increase of anti-H1 stalk antibody titer from Day 1, is calculated with exact 95% CI by MN assay.

Percentage of subjects with a ≥ 4-fold increase of anti-H1 stalk antibody titer from Day 1, is calculated with exact 95% CI by MN assay.

Percentage of subjects with a ≥ 10-fold increase of anti-H1 stalk antibody concentration, from Day 1, is calculated with exact 95% CI by ELISA.

Percentage of subjects with a ≥ 10-fold increase of anti-H1 stalk antibody concentration, from Day 1, is calculated with exact 95% CI by ELISA.

Percentage of subjects with a ≥ 10-fold increase of anti-H1 stalk antibody titer from Day 1, is calculated with exact 95% CI by MN assay.

Percentage of subjects with a ≥ 10-fold increase of anti-H1 stalk antibody titer from Day 1, is calculated with exact 95% CI by MN assay.

MGI is defined as the geometric mean of the fold increase in serum HI concentration post-vaccination compared to Day 1

MGI is defined as the geometric mean of the fold increase in serum HI concentration post-vaccination compared to Day 1

MGI is defined as the geometric mean of the fold increase in serum HI titer post-vaccination compared to Day 1

MGI is defined as the geometric mean of the fold increase in serum HI titer post-vaccination compared to Day 1