Subject(s)

Pneumococcal Infections/epidemiology , Streptococcus pneumoniae/immunology , Adolescent , Age Distribution , Antibodies, Bacterial/blood , Case-Control Studies , Child , Child, Preschool , Cohort Studies , Colombia/epidemiology , Enzyme-Linked Immunosorbent Assay , Female , Humans , Immunoglobulin G/blood , Incidence , Infant , Male , Minnesota/epidemiology , Pneumococcal Infections/blood , Seroepidemiologic Studies