Long-term Follow-up Study to Assess Antibody Persistence in Children Previously Vaccinated With Four Doses of Pneumococcal Conjugate Vaccine in Primary Vaccination Study (105553) and Booster Vaccination Study (107046)

This protocol posting deals with objectives & outcome measures of the extension phase up to 48-50 months post booster vaccination, to assess long-term antibody persistence in children at around 30, 42 and 66 months of age, who received previously 4 doses of pneumococcal conjugate vaccine. The objectives & outcome measures of the primary phase are presented in a separate protocol posting (NCT number = 00307554). This Protocol posting has been updated in order to comply with the FDA AA (Sep 2007).