Dataset from Observer-blind Superior Efficacy Trial With GlaxoSmithKline Biologicals' Influenza Vaccine GSK2186877A in Elderly Subjects

The purpose of this study is to evaluate the efficacy of GlaxoSmithKline Biologicals' influenza vaccine GSK2186877A in adults 65 year of age and older. The study design is divided in two surveillance phases: one passive phase along the study during the influenza season and one active surveillance phase during the influenza peak season.