| Catalase Test | |
 | 
|
| Positive | Negative |
| Gram Stain | |
 | 
|
 | 
|
| Positive Staphylococcus aureus | Beta-hemolysis on blood agar bacitracin sensitive |
| Group A streptococcus (S. pyogenes) | |
| | |
 | 
|
| Negative Staphylococcus epidermidis | Beta hemolysis on blood agar CAMP test positive |
| Group B streptococcus (S. agalactiae) | |
| | |
| |
| Alpha hemolysis on blood agar optochin sensitive | |
| Streptococcus pneumoniae (pneumococcus) | |
| | |
| |
| Alpha hemolysis on blood agar optochin negative | |
| Streptococcus, viridans group | |
| | |
| |
| Gamma hemolysis on blood agar bile esculin agar positive growth in BHI broth with 6.5% NaCl | |
| Group D enterococcus | |
| | |
| Gamma hemolysis on blood agar bile esculin agar positive no growth in BHI broth with 6.5% NaCl | |
| Group D non-enterococcus | |