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Monovalent RIVM meningococcal B OMP vesicle F91 vaccines in toddlers

Monovalent RIVM meningococcen B OMP vesicle F91 vaccins in peuters

Synopsis

This report gives the results of a randomised phase-II clinical study into the safety and immunogenicity of a monovalent MenB OMV vaccine expressing P1.7h,4 PorA (MonoMen) in toddlers. Safety and immunogenicity are compared for two types of vaccine that are differently adjuvated (either aluminium phosphate or aluminium hydroxide). MonoMen is administred a 3- or 4-dose schedule with vaccinations at 0, 2 and 8 or 0, 1, 2 and 8 months. A total of 134 children were included in the study. No serious adverse events occurred during the study. Only mild local and systemic reactions were reported during the observation period. None of the children showed bactericidal activity against the PorA negative mutant strain H1.5, illustrating PorA specificity of the antibody response. In general, the SBA response was highest in the AlPO4 groups, which means that adsorption of the RIVM meningococcal vaccines to AlPO4 seems preferable to Al(OH)3. After the primary series slightly higher titres were found in children who received two vaccinations instead of three, which is probably due to the longer intervals between the vaccinations in the 2+1-schedule. After the booster vaccination significantly higher GMT's were found in children vaccinated according to the 3+1-schedule. Even though the 3+1-schedule seems better with respect to GMT's, the percentages of immune responders showed only minor differences between the two schedules. Both this study and the study concerning the booster effect of MonoMen in children primed with a hexavalent MenB vaccine showed that MonoMen is a safe and immunogenic vaccine.
 

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