A Study to Evaluate the Safety and Immunogenicity of GlaxoSmithKline (GSK) Biologicals' Quadrivalent Influenza Candidate Vaccine (GSK2321138A) Manufactured Using a New Process in Adults and Children

The purpose of this trial is to demonstrate the acceptable safety profile and the immunological non-inferiority of the FLU D-QIV vaccine manufactured with this investigational process (FLU D-QIV Investigational Process [IP]) compared to FLU D-QIV manufactured with the current licensed process (FLU D-QIV Licensed Process [LP]).