Gram ⊕ cocci, β-hemolytic, bacitracin resistant, colonizes vagina.

- Causes pneumonia, meningitis, and sepsis, mainly in babies

- Produces CAMP factor, which enlarges the area of hemolysis formed by S aureus.- Hippurate test ⊕. PYR ⊝.

- Screen pregnant woman at 35-37 weeks of gestation with rectal and vaginal swabs. Patients with ⊕ culture receive intrapartum penicillin prophylaxis.