Study to Evaluate the Immunogenicity and the Safety of an Adjuvanted Influenza Vaccine Candidate

Titers are presented as geometric mean titers (GMTs). The 3 influenza strains assessed were A/New Caledonia, A/Wisconsin and B/Malaysia. The seropositivity cut-off assay was 1:10.

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 3 influenza strains assessed were A/New Caledonia, A/Wisconsin and B/Malaysia.

A seroprotected subject was defined as a vaccinated subject who had a serum HI titer ≥ 1:40. The 3 influenza strains assessed were A/New Caledonia, A/Wisconsin and B/Malaysia.

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. The 3 influenza strains assessed were A/New Caledonia, A/Wisconsin and B/Malaysia.

The geometric mean was calculated for CD4 T-cells (per million CD4 T-cells) producing at least two different cytokines (All Doubles), at least CD40L, at least INF gamma (IFN-g), at least IL2 and at least TNF alpha (TNF-α).

The geometric mean was calculated for CD8 T-cells (per million CD8 T-cells) producing at least two different cytokines (All Doubles), at least CD40L, at least INF gamma (IFN-g), at least IL2 and at least TNF alpha (TNF-α).

Assessed solicited local symptoms were ecchymosis, pain, redness and swelling at injection site. Any = incidence of a particular symptom regardless of intensity grade. Grade 3 pain = pain that prevented normal activity. Grade 3 redness/swelling/ecchymosis = redness/swelling/ecchymosis spreading beyond 50 millimeters (mm) of the injection site. All solicited local symptoms were considered to be related to vaccination.

Assessed solicited general symptoms were arthralgia, fatigue, fever [axillary temperature equal to or above (≥) 37.5 degrees Celsius (°C)], headache, muscle aches and shivering. Any = incidence of a particular symptom regardless of grade intensity or relationship with the study vaccination. Grade 3 symptom = symptom that prevented normal activity. Grade 3 fever = fever > 39.0°C. Related = symptom considered by the investigator to have a causal relationship to study vaccination.

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 = any unsolicited AE regardless of intensity or relationship to vaccination. Grade 3 = unsolicited AE that prevented everyday activities. Related = unsolicited AE assessed by the investigator as related to the vaccination.

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. Related = SAE considered by the investigator to have a causal relationship to study vaccination.