Antibody titers were expressed as Geometric Mean Titers (GMTs). The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

Seropositivity was defined as number of subjects with antibody titers greater than or equal to (≥) 1:10. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

A seroconverted subject was defined as a subject who had either a pre-vaccination titer below 1:10 and a post-vaccination titer ≥ 1:40 or a pre-vaccination titer ≥ 1:10 and at least a 4-fold increase in post-vaccination titer. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

MGI was defined as the fold increase in serum HI GMT post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

Seroprotection rate (SPR) was defined as the number of vaccinees with serum haemagglutination inhibition (HI) titer ≥ 1:40 that usually is accepted as indicating protection in adults. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

Antibody titers were expressed as Geometric Mean Titers (GMTs). The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

Seropositivity was defined as number of subjects with antibody titers greater than or equal to (≥) 1:10. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

A seroconverted subject was defined as a subject who had either a pre-vaccination titer <1:10 and a post-vaccination titer greater than or equal to 1:40 or a pre-vaccination titer greater than or equal to 1:10 and at least a four-fold increase in post-vaccination titer. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria)and B/Hubei-Wujiagang/158/2009 (Yamagata )antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

Mean geometric increase was defined as the geometric mean of the within subject ratios of the post-vaccination reciprocal HI titer to the Day 0 reciprocal HI titer. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011(H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

Seroprotection rate was defined as the number of vaccinees with a serum HI titer greater than or equal to(≥) 1:40 that usually is accepted as indicating protection in adults. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011(H3N2), B/Brisbane/60/2008 (Victoria)and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

The cut-off values assessed were less than (<) 1:10, 1:10 to < 1:40 and ≥ 1:40. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

Antibody titers were expressed as Geometric mean titers (GMTs). The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

Antibody titers were expressed as GMTs. The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

VRR was defined as the number of vaccinees who had either a pre-vaccination titer \

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

MGI was defined as the fold increase in serum HI GMT post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

VRR was defined as the number of vaccinees who had either a pre-vaccination titer \

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

MGI was defined as the fold increase in serum HI GMT post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available.

The cut-off values assessed were less than (<) 1:10, 1:10 to < 1:40,≥ 1:40, ≥1:60 and ≥1:80 . The vaccine strains included A/Christchurch/16/2010 ( H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

MN antibody titers were expressed as geometric mean titers(GMTs). The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

NI (Neuraminidase inhibitor) antibody titers were expressed as geometric mean titers(GMTs).The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

VRR was defined as the number of vaccinees who had either a pre-vaccination titer \

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

MGI was defined as the fold increase in GMTs post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

VRR was defined as the percentage of vaccinees who had either a pre-vaccination titer \

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

MGI was defined as the fold increase in GMTs post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.

Analyses was performed on According-to-Protocol cohort for immunogenicity (ATP-I) excluding subjects who had an RT-PCR confirmed influenza infection in study 115345 consisted of all evaluable subjects from the ATP-I, excluding subjects who had an RT-PCR confirmed influenza infection in study 115345.

Antibody titers were expressed as geometric mean titers. The vaccine strains included A/Christchurch/16/2010 (H1N1),A/Victoria/361/2011 (H3N2), A/Victoria/361/2011 and B/Hubei-Wujiagang/158/2009)(Yamagata) antigens. The humoral response in terms of neutralising antibodies for all vaccine strains were calculated by age stratum which included 17-29 months and 30-48 months age groups for both the Fluarix primed and unprimed groups.

Analysis was performed on According-to-Protocol (ATP) cohort for immunogenicity which included all evaluable subjects who received study vaccine according to their treatment assignment, for whom assay results for antibodies against at least 1 study vaccine strain after vaccination and data concerning immunogenicity outcome measures were available

Antibody titers were expressed as geometric mean titers. The vaccine strains included A/Christchurch/16/2010(H1N1), A/Victoria/361/2011(H3N2),B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009(Yamagata) antigens. The humoral response in terms of anti-neuraminidase antibodies for all vaccine strains were calculated by age stratum which included 17-29 months and 30-48 months age groups for both the Fluarix primed and unprimed groups.

Analyses were performed on the ATP cohort for immunogenicity which included all evaluable subjects who received the study vaccine according to their treatment assignment, for whom the assay results for antibodies against at least one study vaccine strain after vaccination and for whom data concerning immunogenicity outcome measures were available.

VRR was defined as the percentage of vaccinees who had either a pre-vaccination titer \

Analyses were perfomed on the ATP cohort for immunogenicity which included all evaluable subjects who received the study vaccine according to their treatment assignment, for whom the assay results for antibodies against at least one study vaccine strain after vaccination and for whom data concerning immunogenicity outcome measures were available

MGI was defined as the fold increase in GMTs post-vaccination compared to Day 0.The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens.The humoral response in terms of neutralising antibodies for all vaccine strains were calculated by age stratum which included 17-29 months and 30-48 months age groups for both the Fluarix primed and unprimed groups.

Analyses were performed on the ATP cohort for immunogenicity which included all evaluable subjects who received the study vaccine according to their treatment assignment, for whom the assay results for antibodies against at least one study vaccine strain after vaccination and for whom data concerning immunogenicity outcome measures were available.

VRR was defined as the percentage of vaccinees who had either a pre-vaccination titer \

Analyses were performed on the ATP cohort for immunogenicity which included all evaluable subjects who received the study vaccine according to their treatment assignment, for whom the assay results for antibodies against at least one study vaccine strain after vaccination and for whom data concerning immunogenicity outcome measures were available.

MGI was defined as the fold increase in GMTs post-vaccination compared to Day 0. The vaccine strains included A/Christchurch/16/2010 (H1N1), A/Victoria/361/2011 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Hubei-Wujiagang/158/2009 (Yamagata) antigens. The humoral response in terms of anti-neuraminidase antibodies for all vaccine strains were calculated by age stratum which included 17-29 months and 30-48 months age groups for both the Fluarix primed and unprimed groups.

Analyses were performed on the ATP cohort for immunogenicity which included all evaluable subjects who received the study vaccine according to their treatment assignment, for whom the assay results for antibodies against at least one study vaccine strain after vaccination and for whom data concerning immunogenicity outcome measures were available

Solicited local AEs assessed were pain, redness and swelling. Any = any solicited local AE reported irrespective of intensity grade. Grade 3 pain = cried when limb was moved/spontaneously painful. Grade 3 redness and swelling was defined as redness/swelling above 50 millimeter (mm).

Analysis was performed on the Total Vaccinated cohort included all subjects with at least one vaccine administration documented and symptom sheet completed.

Duration was defined as number of days with any grade of solicted local and/or general symptoms

Analysis was performed on the Total Vaccinated cohort included all subjects with at least one vaccine administration documented and symptom sheet completed only on subjects that reported the specific symptom.

Solicited general symptoms assessed were drowsiness, Irritability/Fussiness, loss of appetite and Temperature. Any Temperature = axillary temperature ≥37.5 degrees Celsius (°C). Any = any solicited general symptom reported irrespective of intensity and relationship to vaccination. Related = symptoms considered by the investigator to have a causal relationship to vaccination. Grade 3 symptoms = symptoms that prevented normal activity. Grade 3 Irritability/Fussiness = Crying that could not be comforted/prevented normal activity. Grade 3 loss of appetite = did not eat at all. Grade 3 temperature = axillary temperature > 39.0°C.

Analysis was performed on the Total Vaccinated cohort included all subjects with at least one vaccine administration documented and symptom sheet completed.

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

Analysis was performed on the Total Vaccinated cohort included all subjects with at least one vaccine administration documented.

pIMDs were defined as a subset of AEs that included autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have had an autoimmune aetiology. Any pIMDs= Any AEs that occured regardless of the relation with vaccination. Related pIMDs= Any pIMD assessed by the investigator as casually related to the study vaccination.

Analysis was performed on the Total Vaccinated cohort included all subjects with at least one 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 included all subjects with at least one 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 included all subjects with at least one vaccine administration documented.