Streptococcus pyogenes
Most cases of erysipelas are due to "Streptococcus pyogenes", also known as "group A β-hemolytic streptococci", less commonly by group C or G streptococci and rarely due to "Staphylococcus aureus". Newborns may contract erysipelas due to "Streptococcus agalactiae", also known as "group B streptococcus" or GBS.