Grade 3 ecchymosis, redness and swelling was greater than or equal to 100 millimeter (mm) i.e. ≥ 100 mm and grade 3 pain was considerable pain at rest, that prevented normal everyday activities. Any was occurrence of any local symptom regardless of their intensity grade.

Duration was defined as number of days with any grade of local symptoms and grade for quantifiable symptoms: ecchymosis, redness and swelling was greater than (\>) 20mm.

Any fever was defined as oral temperature ≥38.0 degree centigrade (°C), grade 3 fever was oral temperature \>40.0°C. For other symptoms, any was defined as occurrence of any general symptom regardless of intensity grade or relationship to vaccination, grade 3 was defined as a general symptom that prevented normal activity and related was a general symptom assessed by the investigator as causally related to the study vaccination.

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

Unsolicited adverse event (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, grade 3 was unsolicited symptom that prevented normal activity and related was event assessed by the investigator as possibly related to the study vaccination.

For each solicited and unsolicited AE the subject experienced, the subject was asked if they had received medical attention defined as hospitalization, an emergency room visit or a visit to or from medical personnel (medical doctor) for any reason. Any was defined as occurrence of any symptom regardless of intensity grade, grade 3 was defined as symptom that prevented normal activity and related was general symptom assessed by the investigator as possibly related to the study vaccination.

For each solicited and unsolicited AE the subject experienced, the subject was asked if they had received medical attention defined as hospitalization, an emergency room visit or a visit to or from medical personnel (medical doctor) for any reason. Any was defined as occurrence of any symptom regardless of intensity grade, grade 3 was defined as symptom that prevented normal activity and related was general symptom assessed by the investigator as possibly related to the study vaccination.

AESI for safety monitoring are a subset of AEs that include both clearly autoimmune diseases and also other inflammatory and/or neurologic disorders which may or may not have an autoiimune etiology. Any was defined as occurrence of any symptom regardless of intensity grade, grade 3 was defined as symptom that prevented normal activity and related was general symptom assessed by the investigator as possibly related to the study 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. Any was defined as occurrence of any symptom regardless of intensity grade and related was event assessed by the investigator as causally related to the study 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. Any was defined as occurrence of any symptom regardless of intensity grade and related was event assessed by the investigator as causally related to the study 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. Any was defined as occurrence of any symptom regardless of intensity grade and related was event assessed by the investigator as causally related to the study vaccination.

Occurrence of PCR-confirmed influenza A and/or B infection, due to any matching or drift influenza strain relative to the vaccine strains (i.e. not emerging novel human influenza strain like H1N1v). PCR-confirmed influenza (PCI) was defined as an episode of influenza-like illness (ILI) occurring after the administration of the study vaccine for which a nasal and throat swab specimen yields influenza virus A and/or B by reverse transcription polymerase chain reaction (RT-PCR) analysis.

Vaccine strains assessed were A/Brisbane/59/2077, A/Uruguay/716/2007 and B/Brisbane/3/2007. Titers were expressed as geometric mean titers calculated on all subjects in the lot-to-lot subset of subjects.