Efficacy, safety, and immunogenicity of a meningococcal group B (15:P1.3) outer membrane protein vaccine in Iquique, Chile. Chilean National Committee for Meningococcal Disease. 1995, Boslego, Vaccine

Clinical trial of serogroup B vaccine in Chile (40,000 people). Other meningococcal serogroups vaccine was used as placebo. Vaccine effectiveness was 51% during 2.5 years, and among children under 5 years old, effectiveness was negative (-23%).

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