Booster and immune memory study

Total: All 689 subjects enrolled in study 103488. 23PS group: Aventis Pasteurs' 23-valent polysaccharide pneumococcal vaccine (Pneumovax 23) + DTPa-HBV-IPV/Hib; 10V group: GSK Biologicals' 10-valent pneumococcal conjugate vaccine + DTPa-HBV-IPV/Hib

Inclusion criteria: Male or female between, and including, 11-18 months of age at the time of vaccination and who previously participated in the study 11PN-PD-DIT-002 and received at least one dose of pneumococcal conjugate vaccine during the primary study, free of obvious health problems and with written informed consent obtained from the parent/guardian of the subject. Exclusion criteria: Use of any investigational or non-registered 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. Planned administration/ administration of a vaccine not foreseen by the study protocol during the period starting one month before the first dose of vaccine(s) and during the entire study period. Administration of any additional pneumococcal vaccine or DTPa combined vaccine since study end of 11PN-PD-DIT-002 study

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.