Streptococcal IdentificationLaboratory testing algorithm for groups A, B, D, and pneumococci. Hover over the animation to start / stop rotationGram Stain ![]() Catalase Test ![]() Streptococci Beta-hemolysis on Blood Agar ![]() Group A Streptococcus (S. pyogenes) Beta Hemolysis on Blood Agar ![]() Group B Streptococcus (S. agalactiae) Alpha Hemolysis on Blood Agar ![]() Streptococcus pneumoniae (pneumococcus) Alpha Hemolysis on Blood Agar ![]() Streptococcus, viridans group Gamma Hemolysis on Blood Agar Bile Esculin Agar Positive Growth in BHI Broth with 6.5% NaCl ![]() Gamma Hemolysis on Blood Agar Bile Esculin Agar Positive No Growth in BHI Broth with 6.5% NaCl ![]() |
![]() ![]() ![]() |