A Study to Evaluate the Safety and Immunogenicity of GSK Biologicals' Seasonal Influenza Vaccine in Children

Titers are presented as geometric mean titers (GMTs). The reference cut-off value was the seropositivity cut-off of 1:10. Antibodies assessed were antibodies against the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains.

A seroconverted subject was defined as a vaccinated subject who had either a pre-vaccination titer < 1:10 and a post-vaccination titer ≥1:40, or a pre-vaccination titer ≥1:10 and at least a four-fold increase in post-vaccination titer. The vaccine strains assessed were the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains.

Titers are presented as geometric mean titers (GMTs). The reference cut-off value was the seropositivity cut-off of 1:10. Antibodies assessed were antibodies against the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains.

A seroprotected subject was defined as a vaccinated subject with serum Hemagglutination Inhibition titer ≥ 1:40. The 4 assessed influenza strains were the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 flu strains.

The seroconversion factor (SCF) was defined as the fold increase in serum Hemagglutination Inhibition (HI) geometric mean titers (GMTs) post vaccination (at Day 28 for Primed Subjects and at Day 56 for Unprimed Subjects (POST)) compared to Day 0 (i.e. the geometric mean of the within-subject ratios of the post-vaccination reciprocal HI titer to the pre-vaccination reciprocal HI titer). The 4 assessed influenza strains were the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains

Titers are presented as geometric mean titers (GMTs). The reference cut-off value was the seropositivity cut-off of 1:10. Antibodies assessed were antibodies against the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains. Subjects were assessed according to 3 age categories, 3-8 years, 9-17 years and 6-35 months.

A seroconverted subject was defined as a vaccinated subject who had either a pre-vaccination titer < 1:10 and a post-vaccination titer ≥1:40, or a pre-vaccination titer ≥1:10 and at least a four-fold increase in post-vaccination titer. The vaccine strains assessed were A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains. Subjects were assessed according to 3 age categories, 3-8 years, 9-17 years and 6-35 months.

A seroprotected subject was defined as a vaccinated subject with serum Hemagglutination Inhibition titer ≥ 1:40. The 4 assessed influenza strains were the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 flu strains. Subjects were assessed according to 3 age categories, 3-8 years, 9-17 years and 6-35 months.

The seroconversion factor (SCF) was defined as the fold increase in serum Hemagglutination Inhibition (HI) geometric mean titers (GMTs) post vaccination compared to Day 0 (i.e. the geometric mean of the within-subject ratios of the post-vaccination reciprocal HI titer to the pre-vaccination reciprocal HI titer). The 4 assessed influenza strains were the A/California/7/2009 (H1N1), A/Victoria/210/2009 (H3N2), B/Brisbane/60/2008 (Victoria) and B/Florida/4/2006 (Yamagata) flu strains. Subjects were assessed according to 3 age categories, 3-8 years, 9-17 years and 6-35 months.

Solicited local symptoms assessed were pain, redness and swelling. Any was defined as any solicited local symptom reported irrespective of intensity grade. Grade 3 pain for subjects < 5 years of age = Cried when limb was moved/spontaneously painful; Grade 3 pain for subjects ≥ 5 years of age = Significant pain at rest, pain that preventeded normal everyday activities. Grade 3 redness and swelling were defined as redness/swelling above 100 millimeters (mm).

Duration was assessed via tabulation of the number of days with local symptoms of any grade after vaccination with Dose 1 and Dose 2 respectively. Solicited local symptoms assessed for duration were pain, redness and swelling.

Symptoms assessed were drowsiness, irritability, loss of appetite and temperature. Any = Incidence of a particular symptom regardless of intensity grade or relationship to vaccination. Any temperature = Axillary temperature ≥ 38.0 degrees Celsius (°C). Grade 3 temperature = Axillary temperature ≥ 39.0°C. Grade 3 irritability = Crying that could not be comforted/ preventing normal activity. Grade 3 drowsiness = Drowsiness preventing normal activity. Grade 3 loss of appetite = Not eating at all. Related = A general symptom assessed by the investigator as causally related to vaccination.

Solicited general symptoms assessed were fatigue, gastrointestinal symptoms, headache, joint pain at other location, muscle aches, shivering and temperature. Any = Incidence of a particular symptom regardless of intensity grade or relationship to vaccination. Any temperature = axillary temperature ≥ 38.0 °C. Grade 3 temperature = axillary temperature ≥ 39.0°C. Grade 3 symptom = Symptom that prevented normal activity. Related = A general symptom assessed by the investigator as causally related to vaccination.

Duration was assessed via tabulation of the number of days with local symptoms of any grade after vaccination with Dose 1 and Dose 2, respectively. Solicited general symptoms assessed for duration in subjects below 5 years of age were drowsiness, irritability and loss of appetite.

Duration was assessed via tabulation of the number of days with local symptoms of any grade after vaccination with Dose 1 and Dose 2, respectively. Solicited general symptoms assessed for duration in subjects 5 years of age and above were fatigue, gastrointestinal symptoms, headache, joint pain at other location, muscle aches and shivering.

Duration for fever was assessed via tabulation of the number of days with local symptoms of fever (axillary temperature ≥ 38°C) after vaccination with Dose 1 and Dose 2, respectively.

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 unsolicited AE(s) = Occurrence of any unsolicited symptom regardless of intensity grade or relation to vaccination. Grade 3 unsolicited AE = Occurrence of any unsolicited AE that prevented normal activities. Related unsolicited AE(s) = Occurrence of an unsolicited AE assessed by the investigator to be causally related to vaccination.

Potential immune-mediated diseases (pIMDs) are a subset of adverse events that include both clearly autoimmune diseases and also other inflammatory and/or neurologic disorders which may or may not have an autoimmune etiology.

Any pIMD(s) = Occurrence of any pIMD(s) regardless of intensity grade or relation to vaccination. Related pIMD(s) = pIMD assessed by the investigator as causally related to the study vaccination.

Medically-attended adverse events (MAEs) were non-serious and serious events leading to an otherwise unscheduled visit to or from medical personnel for any reason, including emergency room visits. If a medically-attended adverse event was leading to hospitalization (or met any other criterion for serious adverse event (SAE)), it was reported as SAE. Any MAE(s) = Occurrence of any MAE(s) regardless of intensity grade or relation to vaccination.Relationship to vaccination was not assessed for MAEs.

SAEs assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization, result in disability/incapacity or are a congenital anomaly/birth defect in the offspring of a study subject. Any SAE(s) = Occurrence of any SAE(s) regardless of intensity grade or relation to vaccination. Related SAE(s)= Occurrence of any SAE(s) assessed by the investigator as causally related to vaccination.