Effectiveness of meningococcal vaccine in Brazil.
Costa
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D001938:Brazil / Q000453:epidemiology; D002648:Child; D002673:Child, Hospitalized / Q000706:statistics & numerical data*; D002675:Child, Preschool; D006297:Health Services Accessibility; D006801:Humans; D007223:Infant; D008589:Meningococcal Infections / Q000453:epidemiology* / Q000401:mortality / Q000517:prevention & control*; D017063:Outcome Assessment, Health Care / Q000592:standards*; D015983:Selection Bias; D012698:Serologic Tests / Q000706:statistics & numerical data*; D014611:Vaccination / Q000706:statistics & numerical data*