Antibody titers were expressed as Geometric mean titers (GMTs). The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seropositive subject was a subject whose HI antibody titer was greater than or equal to the assay cutoff value of 1:10. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seroprotected subject was defined as a vaccinated subject with a serum HI titer greater than or equal to (≥) 1:40 that usually is accepted as indicating protection in adults. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seroconverted subject was defined as a vaccinated subject with either a pre-vaccination HI titer less than (<) 1:10 and a post-vaccination HI titer ≥1:40 or pre-vaccination HI titer ≥ 1:10 and at least a 4-fold increase in post-vaccination HI titer. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

SPP was defined as the number of vaccinated subjects with a pre-vaccination titer < 1:40 and a post-vaccination titer ≥ 1:40.

The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

MGI also known as the seroconversion factor [SCF] was defined as the fold increase in serum HI GMTs post vaccination compared to pre-vaccination (Day 0). The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

Antibody titers were expressed as GMTs. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seropositive subject was a subject whose HI antibody titer was greater than or equal to the assay cutoff value of 1:10. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seroprotected subject was defined as a vaccinated subject with a serum HI titer ≥ 1:40 that usually is accepted as indicating protection in adults. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

MGI also known as the seroconversion factor [SCF] was defined as the fold increase in serum HI GMTs post vaccination compared to pre-vaccination (Day 0). The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

A seroconverted subject was defined as a vaccinated subject with either a pre-vaccination HI titer less than (<) 1:10 and a post-vaccination HI titer ≥1:40 or pre-vaccination HI titer ≥1:10 and at least a 4-fold increase in post-vaccination HI titer. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

SPP was defined as the number of vaccinated subjects with a pre-vaccination titer < 1:40 and a post-vaccination titer ≥ 1:40. The vaccine strains assessed were Flu A/Christchurch/16/2010 (H1N1), Flu A/Switzerland/9715293/2013 (H3N2), Flu B/Phuket/3073/2013 (Yamagata) and Flu B/Brisbane/60/2008 (Victoria).

Analysis was performed on the According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects for whom data concerning immunogenicity outcome measures were available and subjects for whom assay results were available for antibodies against at least one study vaccine antigen component after vaccination.

Solicited local symptoms assessed were pain, redness and swelling. Any was defined as any solicited local symptom reported irrespective of intensity. Grade 3 pain was defined as pain that prevented normal everyday activities. Grade 3 redness and swelling was greater than 100 millimeters (mm) i.e. >100mm.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

Solicited general symptoms assessed were Arthralgia, Fatigue, Gastrointestinal symptoms, Headache, Myalgia, Shivering, Sweating and Temperature (Oral). Any was defined as any general symptom reported irrespective of intensity or relationship to vaccination. Grade 3 was defined as symptoms that prevented normal activity. Related was defined as general symptom assessed by the investigator to have a causal relationship to vaccination.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

Duration was defined as number of days with any grade of local symptoms.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

MAEs were defined as AEs with a medically-attended visit i.e. prompting emergency room (ER) visits, hospitalizations or physician visits and that were not routine visits for physical examination or vaccination. Any MAE was defined as at least one MAE experienced. Grade 3 was defined as MAEs that prevented normal activities and related was defined as MAEs assessed by the investigator to be causally related to the study vaccination.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

Duration was defined as number of days with any grade of general symptoms.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

Unsolicited AE covers any AE 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 was defined as occurrence of any unsolicited symptom regardless of intensity grade or relation to vaccination. Grade 3 was an event that prevented normal activities and related was defined as an unsolicited AE assessed by the investigator to be causally related to the study vaccination.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.

A serious adverse event was any untoward medical occurrence that: resulted in death, was life-threatening, required hospitalization or prolongation of existing hospitalization, resulted in disability/incapacity or was a congenital anomaly/birth defect in the offspring of a study subject. Any was defined as occurrence of any symptom regardless of intensity grade or relation to vaccination and related was an event assessed by the investigator as causally related to the study vaccination.

Analysis was performed on the Total Vaccinated cohort, which included all subjects with vaccine administration documented.