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 \[LP\]).

This study will enroll 3 age cohorts:

Adults: 18-49 years, Children: 3-17 years and 6-35 months of age.

Eligibility Criteria:
Inclusion Criteria:

Adults 18-49 years cohort:

* A male or female between, and including, 18 and 49 years of age at the time of vaccination.
* Subjects who the investigator believes that they/their parent(s)/Legally Acceptable Representatives (LAR(s)) can and will comply with the requirements of the protocol.
* Written informed consent obtained from the subject/parent(s)/LAR(s) of the subject.
* Written informed assent obtained from the subject if/as required by local regulations.
* Healthy subjects or those with chronic well-controlled disease as established by medical history and clinical examination before entering into the study.
* Female subjects of non-childbearing potential may be enrolled in the study. Non-childbearing potential is defined as pre-menarche, current tubal ligation, hysterectomy, ovariectomy.
* Female subjects of childbearing potential may be enrolled in the study, if the subject: has practiced adequate contraception for 30 days prior to vaccination, and has a negative pregnancy test on the day of vaccination, and has agreed to continue adequate contraception for 2 months after vaccination.

Pediatric cohort:

United States:

• A male or female subject between, and including, the ages of 3 and 17 years in the United States.

Rest of the World:

• A male or female subject between, and including, the ages of 6 months to 17 years all countries with the exception of the United States.

All participating countries:

* Subjects who the investigator believes that they/their parent(s)/Legally Acceptable Representatives (LAR(s)) can and will comply with the requirements of the protocol.
* Written informed consent obtained from the subject/parent(s)/LAR(s) of the subject.
* Written informed assent obtained from the subject if/as required by local regulations.
* Healthy subjects or those with chronic well-controlled disease as established by medical history and clinical examination before entering into the study.
* Female subjects of non-childbearing potential may be enrolled in the study. Non-childbearing potential is defined as pre-menarche, current tubal ligation, hysterectomy, ovariectomy.
* Female subjects of childbearing potential may be enrolled in the study, if the subject: has practiced adequate contraception for 30 days prior to vaccination, and has a negative pregnancy test on the day of vaccination, and has agreed to continue adequate contraception during the entire treatment period and for 2 months after completion of the vaccination series.

Exclusion Criteria:

Adults aged 18-49 years cohort:

* Child in care.
* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine within 30 days preceding the first dose of study vaccine, or planned use during the study period.
* Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product (pharmaceutical or device).
* Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immune-modifying drugs within 6 months prior to the first vaccine dose. Inhaled and topical steroids are allowed.
* Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination.
* Any administration of a long-acting immune-modifying drug within 6 months before study start, or planned administration during the study period.
* Administration of an influenza vaccine during the 6 months preceding entry into the study.
* Administration of a vaccine not foreseen by the study protocol within 30 days before vaccination or planned administration during the study period.
* Administration of immunoglobulins and/or any blood products within the 3 months preceding the first dose of study vaccine or planned administration during the study period.
* Any known or suspected allergy to any constituent of influenza vaccines (including egg proteins); a history of anaphylactic-type reaction to consumption of eggs; or a history of severe adverse reaction to a previous influenza vaccine.
* Acute or un-controlled, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory tests.
* Any history of Guillain-Barré Syndrome.
* Acute disease and/or fever at the time of enrolment. Fever is defined as temperature ≥ 38.0ºC/100.4ºF.
* Pregnant or lactating female.
* Female planning to become pregnant or planning to discontinue contraceptive precautions.
* History of chronic alcohol consumption and/or drug abuse.
* Any contra-indication to intramuscular administration of influenza vaccines.
* Any other condition which, in the opinion of the investigator, prevents the subject from participating in the study.

Pediatric cohort

* Child in care.
* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine within 30 days preceding the first dose of study vaccine, or planned use during the study period.
* Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product (pharmaceutical or device).
* Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immune-modifying drugs within 6 months prior to the first vaccination dose. Inhaled and topical steroids are allowed.
* Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination.
* Any administration of a long-acting immune-modifying drug within 6 months before study start, or planned administration during the study period.
* Administration of an influenza vaccine during the 6 months preceding entry into the study.
* Administration of a vaccine not foreseen by the study protocol within 30 days before vaccination or planned administration during the study period.
* Administration of immunoglobulins and/or any blood products within the 3 months preceding the first dose of study vaccine or planned administration during the study period.
* Any known or suspected allergy to any constituent of influenza vaccines (including egg proteins); a history of anaphylactic-type reaction to consumption of eggs; or a history of severe adverse reaction to a previous influenza vaccine.
* Acute or un-controlled, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory tests.
* Any history of Guillain-Barré Syndrome.
* Acute disease and/or fever at the time of enrolment. Fever is defined as temperature ≥ 38.0ºC/100.4ºF.
* Pregnant or lactating female.
* Female planning to become pregnant or planning to discontinue contraceptive precautions.
* History of chronic alcohol consumption and/or drug abuse.
* Any contra-indication to intramuscular administration of influenza vaccines.
* Any other condition which, in the opinion of the investigator, prevents the subject from participating in the study.