Study to evaluate the immunogenicity and safety of GlaxoSmithKline (GSK) Biologicals’ Herpes Zoster vaccine GSK1437173A when co-administered with GSK Biologicals’ seasonal influenza vaccine GSK2321138A in adults aged 50 years and older

Subjects who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g. completion of the diary cards, return for follow-up visits).

• A male or female aged 50 years or older, at the time of the first vaccination with the study vaccine(s).
• Written informed consent obtained from the subject.
• 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 or post-menopause.

• Female subjects of childbearing potential may be enrolled in the study, if the subject:

Use of any investigational or non-registered product (drug or vaccine) other than the study vaccines within 30 days preceding the first dose of study vaccine, or planned use during the study period.

• Chronic administration (defined as more than 14 consecutive days) of immunosuppressants or other immune-modifying drugs within six months prior to the first vaccine dose (for corticosteroids, this will mean prednisone ≥ 20 mg/day, or equivalent). A prednisone dose of < 20 mg/day is allowed. Inhaled, topical and intra-articular corticosteroids are allowed.
• Administration or planned administration of a vaccine not foreseen by the study protocol within the period starting 30 days before the first dose of study vaccine(s) (HZ/su and/or FLU-D-QIV vaccines) and ending 30 days after the last dose of HZ/su vaccine.
• Administration of an influenza vaccine during the six months preceding entry into the study or planned administration up to the last blood sampling with the exception of the FLU-D-QIV vaccine given during this study.
• Administration of long-acting immune-modifying drugs (e.g. infliximab) within six months prior to the first vaccine dose or expected administration at any time 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 vaccine/product (pharmaceutical product or device).
• Previous vaccination against VZV or HZ and/or planned administration during the study of a VZV or HZ vaccine (including an investigational or non-registered vaccine) other than the study vaccine.
• History of HZ.
• Any confirmed or suspected immunosuppressive or immunodeficient condition resulting from disease (e.g., malignancy, HIV infection) or immunosuppressive/cytotoxic therapy (e.g., medications used during cancer chemotherapy, organ transplantation or to treat autoimmune disorders).
• History of any reaction or hypersensitivity likely to be exacerbated by any component of the vaccines.
• History of Guillain Barré syndrome.
• Hypersensitivity to latex.
• Acute disease and/or fever at the time of enrolment.

Subjects with a minor illness (such as mild diarrhoea, mild upper respiratory infection) without fever may, be enrolled at the discretion of the investigator.

• 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.
• Pregnant or lactating female.
• Female planning to become pregnant or planning to discontinue contraceptive precautions before 2 months after the last dose of study vaccine.
• Any condition which, in the opinion of the investigator, prevents the subject from participating in the study.
• Any condition which, in the judgment of the investigator would make intramuscular injection unsafe.