Immunogenicity of the Booster Dose of Two MenC Vaccines
Immunogenicity of the Booster Dose of Two MenC Vaccines
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.
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.
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.