Streptococcal InfectionsStreptococcus pyogenesStreptococcus agalactiaeFasciitis, NecrotizingStreptococcal VaccinesPuerperal InfectionShock, SepticSkin Diseases, BacterialStreptococcus anginosusPopulation SurveillanceBacteremiaSerotypingSurgical Procedures, Minimally InvasiveSoft Tissue InfectionsExotoxinsIncidenceBacterial Outer Membrane ProteinsInfant, NewbornAntigens, BacterialVirulenceStreptococcusAnti-Bacterial AgentsElectrophoresis, Gel, Pulsed-FieldBacterial ProteinsCarrier ProteinsRisk FactorsBacterial Typing TechniquesAntibodies, BacterialDNA, BacterialRetrospective Studies