What does this mean Results 3000 CFU per ml Streptococcus

Patient: What does this meanResults 3000 CFU per ml Streptococcus agalactiae (Group B) The CDC recommends that pregnant women with group B Streptococcus bacteriuria should receive intrapartum chemoprophylaxis.Plus Commensal Perineal FloraReport Status 04/23/2015 Final

Doctor: