Co-Administration of Meningococcal Vaccine GSK134612 With Infanrix Hexa™ Versus Individual Administration of Each Vaccine

The purpose of this study is to demonstrate, in 12-23 months old subjects, the non-inferiority of meningococcal vaccine GSK134612 co-administered with Infanrix hexa™, compared to each vaccine administered individually and to licensed meningococcal vaccine Meningitec™.

The Protocol Posting has been updated in order to comply with the FDA Amendment Act, Sep 2007.

Multicentre study with 4 parallel groups. One group will receive GSK134612 co-administered with Infanrix hexa™, two groups will receive sequential administration of GSK134612 and Infanrix hexa™ and the final group will receive Meningitec™.

For subjects in Groups B and C, three blood samples will be taken: prior to first vaccination and 1 month after each vaccination.

For subjects in Groups A and D, two blood samples will be taken: prior to and 1 month after vaccination.

Eligibility Criteria:
Inclusion Criteria:

* Subjects who the investigator believes that their parents/guardians can and will comply with the requirements of the protocol.
* A male or female between, and including, 12 and 23 months of age at the time of the first vaccination.
* Written informed consent obtained from the parent or guardian of the subject.
* Free of obvious health problems as established by medical history and clinical examination before entering into the study.
* Documented three-dose primary vaccination with DTPa, hepatitis B, inactivated polio and Haemophilus influenzae type b conjugate vaccines, completed at least 180 days before administration of the first study vaccination.

Exclusion Criteria:

* 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 days) of immunosuppressants or other immune-modifying drugs within six months prior to the first vaccine dose.
* Planned administration/ administration of any vaccine not foreseen by the study protocol, including measles, mumps, rubella, varicella and pneumococcal vaccines, within 30 days before the first dose of vaccine(s) and 30 days after the last dose of vaccine(s).
* Previous vaccination with meningococcal polysaccharide vaccine of serogroup A, C, W and/or Y.
* Previous vaccination with meningococcal polysaccharide conjugate vaccine of serogroup A, C, W and/or Y.
* Previous booster vaccination against diphtheria, tetanus, pertussis, hepatitis B, poliomyelitis or Haemophilus influenzae type b.
* History of meningococcal disease.
* Any confirmed or suspected immunosuppressive or immunodeficient condition (congenital or secondary), including human immunodeficiency virus (HIV) infection, based on medical history and physical examination.
* History of reactions or allergic disease likely to be exacerbated by any component of the vaccine(s).
* Major congenital defects or serious chronic illness.
* Acute disease at the time of enrolment.
* Administration of immunoglobulins and/or any blood products within the three months preceding the first dose of study vaccine or planned administration during the study period.

Additional criteria for subjects receiving Infanrix hexa™

* Hypersensitivity reaction due to previous vaccination with Infanrix hexa™.
* Encephalopathy defined as an acute, severe central nervous system disorder occurring within 7 days following vaccination and generally consisting of major alterations in consciousness, unresponsiveness, generalised or focal seizures that persist more than a few hours, with failure to recover within 24 hours.