 Due to a large amount of new research done on the human microbe and more information on bacteria, many species of bacteria have been renamed and re-classified.Based on DNA homology and whole-cell polypeptide-pattern study findings supported by phenotypic characteristics, the DNA homology group of microaerobic streptococci that was formerly known as Streptococcus anginosus or Streptococcus milleri is now composed of three distinct species