Pneumococcal InfectionsStreptococcus pneumoniaePneumonia, PneumococcalPneumococcal VaccinesMeningitis, PneumococcalStreptolysinsVaccines, ConjugateBacteremiaSerotypingAntibodies, BacterialBacterial VaccinesPenicillin ResistancePolysaccharides, BacterialNasopharynxVaccinationPhosphorylcholinePenicillinsBacterial ProteinsAdministration, IntranasalBacterial CapsulesSplenectomyAnti-Bacterial AgentsComplement C4Antigens, BacterialMicrobial Sensitivity TestsLungCommunity-Acquired InfectionsOpsonin ProteinsImmunoglobulin GAnemia, Sickle CellCarrier StateOtitis MediaImmunizationSepsisMice, Inbred CBAMice, Inbred BALB CImmunization, PassiveDrug Resistance, BacterialComplement System ProteinsDisease SusceptibilityMice, Inbred C57BLDrug Resistance, MicrobialPneumoniaPhagocytosisPopulation SurveillanceIncidenceDisease Models, AnimalVirulenceEnzyme-Linked Immunosorbent AssayTime FactorsDNA, BacterialProspective StudiesMice, KnockoutSpleenAge FactorsInfant, NewbornCytokinesRisk Factors