No abstract available
MeSH terms
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Age Factors
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Antibody Formation / immunology
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Child
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Child, Preschool
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Female
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Humans
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Immunization Schedule
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Immunologic Surveillance
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Male
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Mass Screening
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Meningococcal Infections / epidemiology
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Meningococcal Infections / immunology*
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Neisseria meningitidis / immunology*
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Seroepidemiologic Studies
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Spain / epidemiology
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Vaccination*