Immunogenicity of the Booster Dose of Two MenC Vaccines

Phase 4

Completed

Brief Summary: The purpose of the study is to evaluate the immune response of toddlers, to a booster dose in the second year of life of two meningococcal C conjugated polysaccharide vaccine, and to assess the interchangeability of the two different vaccines.

Detailed Description: Children 14 to 18 months of life, previously vaccinated with 2 doses of tetanus toxoid conjugated polysaccharide men C vaccine or three doses of the CRM197 conjugated polysaccharide men C vaccine before 7 months of age, are randomized to receive any of the two vaccines. Serum antibody activity against meningococcus C will be measured inmediately before and 4 weeks after the booster dose. Children will also be vaccinated with a combined vaccine containing DTaP+IPV+Hib.

Recruitment & Eligibility

Inclusion Criteria

Healthy toddlers of both sexes
Toddlers of 14 to 19 months of age (including the day that the toddler is 14 and the day before he is 19 months of age)
Children previously vaccinated with two doses of polysaccharide meningococcal C vaccine conjugated to tetanus toxoid or three doses of polysaccharide meningococcal C conjugated to CRM197 before 7 month of age.
Informed consent signed by one or both parents who are adequately informed about the study.

Exclusion Criteria

Toddlers with severe diseases or axilar temperature ≥ 38,0ºC at inclusion time
Toddlers with severe chronic diseases
Toddlers who have received any other vaccine within the last month or with a programmed vaccination within the 28 subsequent days after the administration of the vaccine of study.
Toddlers with clinical or bacteriological diagnosis of previous meningococcal disease.
Toddlers with hypersensitivity to any of the components of the vaccines to study or antibiotics used during the manufacturing process that could be present as non- detectable traces (streptomycin, neomycin, polymyxin B).
Toddlers with personal history of convulsions.
Toddlers with known bleeding disorder no controlled
Toddlers with known congenital or acquired immunodeficiency
Toddlers who are receiving or have been received any treatment that could change the immune response (administration of intravenous immunoglobulin, systemic corticosteroids or haemoderivates) within the 3 previous months.
A toddler that under investigator opinion is probable to be lost during the follow-up
A toddler that is currently included or is planned to be included in any other clinical trial.
A toddler that under investigator opinion must not be included in the study due to other medical or social reasons.

Arm && Interventions

Group	Intervention	Description
MENC-CRM/MENC-TT	conjugated polysaccharide menC vaccine	Children Primed with three doses of MenC-CRM vaccine. Intervention: boosted with one dose of MenC-TT
MENC-CRM/MENC-CRM	conjugated polysaccharide menC vaccine	Children primed with 3 doses of MenC-CRM vaccine, Intervention: boosted with one dose of MenC-CRM vaccine
MENC-TT/MENC-CRM	conjugated polysaccharide menC vaccine	Children primovacccinated with two MenC-TT vaccine doses. Intervention: boosted with one dose MenC-CRM vaccine
MENC-TT/MENC-TT	conjugated polysaccharide menC vaccine	Children primovacccinated with two MenC-TT vaccine doses. Intervention boosted with one dose MenC-TT vaccine