Immunogenicity and Safety Study of GSK Biologicals' Meningococcal Conjugate Vaccine When Co-administered With Routine Vaccines in Healthy Infants and Toddlers

Inclusion Criteria:

• Subjects who the investigator believes that parent(s)/Legally Acceptable Representative(s) [LAR(s)] can and will comply with the requirements of the protocol.
• A male or female, 6 to 12 weeks (42-90 days) of age at the time of the first vaccination.
• Written informed consent obtained from the parent(s)/LAR(s) of the subject.
• Healthy subjects as established by medical history and clinical examination before entering into the study.
• Born after a gestation period of at least 36 weeks.

Exclusion Criteria:

• Child in care.
• Use of any investigational or non-registered product other than the study vaccine(s) within 30 days preceding the first dose of study vaccine, or planned use during the study period.
• Extended administration of immunosuppressants or other immune-modifying drugs since birth.
• Planned administration/administration of a vaccine not foreseen by the study protocol during the period 30 days before and after each study vaccine administration, with the exception of rotavirus vaccine and seasonal or pandemic influenza vaccine.
• 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.
• Previous vaccination against diphtheria , tetanus, pertussis, polio (with the exception of a birth dose of OPV), Haemophilus influenzae type b, Streptococcus pneumonia.
• History of receipt of meningococcal vaccine.
• Subjects who received a birth dose Hepatitis B vaccines within the 30 days before the administration of the first study vaccine.
• History of or intercurrent diphtheria, tetanus, pertussis, polio, Haemophilus influenzae type b disease, pneumococcal and/or meningococcal disease.
• Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination (no laboratory testing required).
• Family history of congenital or hereditary immunodeficiency.
• History of any reaction or hypersensitivity likely to be exacerbated by any component of th