StreptococcaceaeAbiotrophiaCarnobacteriaceaeGemellaLactobacillaceaeGram-Positive Bacterial InfectionsEndocarditis, BacterialRNA, Ribosomal, 16SMouthPhylogenyStreptococcusBacteriaGenes, rRNADNA, RibosomalBacteremiaGenetic HeterogeneityStreptococcal InfectionsPolymerase Chain ReactionPolymorphism, Restriction Fragment LengthBacterial Typing Techniques